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Non-invasive Technologies Applied in Cultural Heritage

A special issue of Heritage (ISSN 2571-9408).

Deadline for manuscript submissions: closed (31 August 2024) | Viewed by 22410

Special Issue Editors


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Guest Editor
Department of Earth Sciences, Sapienza University of Rome, Rome, Italy
Interests: archaeological ceramics; provenance; pigments; ancient mortars; ore microscopy
School of Earth Sciences, Zhejiang University, Hangzhou, China
Interests: applied geophysics; GPR; archaeology

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Guest Editor
Department of Earth Sciences, Sapienza University of Rome, Rome, Italy
Interests: archaeometry; cultural heritage conservation; geomaterials
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Earth Sciences, Sapienza University of Rome, Rome, Italy
Interests: archaeometry, archaeometallurgy, ancient alloys, cultural heritage conservation

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Guest Editor Assistant
Department of Earth Sciences, Sapienza University of Rome, Rome, Italy
Interests: ancient mortars; Roman aqueducts; cultural heritage conservation; historical cast iron street furniture

Special Issue Information

Dear Colleagues,

Cultural Heritages are part of the history and culture of human beings, therefore their conservation is the main aim of modern Science.

Sciences applied to Cultural Heritage have been growing applications in recent decades with innovative methodologies and techniques, improving the interaction between science, art and conservation. Therefore, new experts with adequate perception of both the problems involved in the conservation of cultural heritage and the scientific methodologies useful to solve these problems, have been trained.

The scientific approach has been appropriately applied in two perspectives: conservation and archaeological study. The first with the aim to find new solutions and products to conserve various kinds of materials, and the second is to improve the knowledge of production technology and past cultures. In both cases, non-invasive techniques are preferred to limit the consumption of the material, favoring the preservation of Cultural Heritage for future generations. Consequently, a large branch of science has been focused on developing new strategies, methodologies, sampling methods, and the elaboration of data to improve the results obtained by non-invasive technologies.

This Special Issue aims to collect scientific contributions on non-invasive technologies applied in Cultural Heritage for new conservative approaches, new archeometric techniques, innovative monitoring techniques and management strategies with particular attention to the projects of Young Researchers.

Topics included in this Special Issue (but not limited to the following):

  • Innovative sampling methods;
  • Non-invasive monitoring methods;
  • 3D reconstructions for the access to Cultural Heritage;
  • New protocols for in situ analysis;
  • Imaging spectroscopy;
  • GIS and database;
  • Photogrammetry and remote sensing;
  • Data processing.

Dr. Silvano Mignardi
Dr. Wenke Zhao
Dr. Laura Medeghini
Dr. Melania Di Fazio
Guest Editors

Laura Calzolari
Guest Editor Assistant

Manuscript Submission Information

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Published Papers (13 papers)

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21 pages, 3973 KiB  
Article
The Iridescent Painting Palette of Michelino da Besozzo: First Results of Non-Invasive Diagnostic Analyses
by Anna Delle Foglie and Anna Candida Felici
Heritage 2024, 7(6), 3013-3033; https://doi.org/10.3390/heritage7060141 - 4 Jun 2024
Viewed by 921
Abstract
This study concerns the characterization of the color palette of Michelino da Besozzo, one of the leading painters and illuminators of the Late Gothic period in Northern Italy. The artist’s relationship with the color blue was investigated by considering the recipe for lapis [...] Read more.
This study concerns the characterization of the color palette of Michelino da Besozzo, one of the leading painters and illuminators of the Late Gothic period in Northern Italy. The artist’s relationship with the color blue was investigated by considering the recipe for lapis lazuli given by the artist to Giovanni Alcherio in Venice in 1410 and found in the medieval treatise of Jean Lebegue. The paper highlights this important evidence for the study of painting technique in the first half of the 15th century with an analytical and technical study of two paintings: The Mystic Marriage of Saint Catherine (Siena, Pinacoteca Nazionale, inv. 171) and The Madonna of the Rose Garden (Verona, Museo di Castelvecchio, inv. 173-1B359). These two case studies were approached through analyses carried out with non-invasive and portable techniques such as Energy Dispersive X-ray Fluorescence (ED-XRF) spectroscopy and Fiber Optics Reflectance Spectroscopy (FORS). The results show a color palette based on ultramarine, azurite, verdigris or copper resinate; earths, cinnabar or vermillion; and lead white, yellow and red ochre and lac. These preliminary results made it possible to clarify certain aspects of the artist’s style and his painting technique and identify common elements between the two works of art. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>On-Site Energy Dispersive X-ray Fluorescence (ED-XRF) spectroscopy analyses: (<b>a</b>) <span class="html-italic">The Mystic Marriage of Saint Catherine</span>, Siena, Pinacoteca Nazionale; (<b>b</b>) <span class="html-italic">The Madonna of the Rose Garden</span>, Verona, Museo di Castelvecchio.</p>
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<p>Michelino da Besozzo, <span class="html-italic">The Mystic Marriage of Saint Catherine</span>, Siena, Pinacoteca Nazionale, with permission from Ministero della cultura. Foto Archivio Musei Nazionali di Siena.</p>
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<p>Michelino da Besozzo (attr.), <span class="html-italic">The Madonna of the Rose Garden</span>, Verona, Musei Civici, Museo di Castelvecchio, Archivio fotografico (foto Gardaphoto, Salò).</p>
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<p>The analyzed areas of <span class="html-italic">The Mystic Marriage of Saint Catherine</span> painting.</p>
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<p>The analyzed areas of <span class="html-italic">The Madonna of the Rose Garden</span> painting.</p>
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<p>Fiber Optics Reflectance Spectroscopy (FORS) spectra measured in the following areas: (<b>a</b>) the areas S1 (black curve) and S2 (blue curve) of the <span class="html-italic">Mystic Marriage of Saint Catherine</span> painting; (<b>b</b>) the areas V1 (red curve) and V2 (orange curve) of the <span class="html-italic">Madonna of the Rose Garden</span> painting. The FORS spectra are characteristic of ultramarine pigment.</p>
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<p>(<b>a</b>) Fiber Optics Reflectance Spectroscopy (FORS) spectrum measured in the area V3 of the <span class="html-italic">Madonna of the Rose Garden</span> painting. The spectral features suggest the presence of ultramarine superimposed to azurite. (<b>b</b>) A detail of the ED-XRF spectrum measured in area V4 of the <span class="html-italic">Madonna of the Rose Garden</span> painting. The peaks relative to the K<sub>α</sub> lines of copper (Cu), cobalt (Co) and chromium (Cr) are indicated.</p>
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<p>Fiber Optics Reflectance Spectroscopy (FORS) spectra measured in the following: (<b>a</b>) areas S3 (black curve) and S4 (blue curve) of the <span class="html-italic">Mystic Marriage of Saint Catherine</span> painting; (<b>b</b>) area V5 (red curve) of the <span class="html-italic">Madonna of the Rose Garden</span> painting. The FORS spectra measured in areas S3 and V5 show the spectral features characteristic of verdigris or copper resinate, while the one measured in area S4 allows us to identify green earth pigment.</p>
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<p>Detail of <span class="html-italic">The Mystic Marriage of Saint Catherine</span> painting: Saint Antony’s shoe.</p>
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<p>(<b>a</b>) Fiber Optics Reflectance Spectroscopy (FORS) spectra measured in area S5 (black curve) of the <span class="html-italic">Mystic Marriage of Saint Catherine</span> painting and area V7 (red curve) of the <span class="html-italic">Madonna of the Rose Garden</span> painting. The FORS spectra suggest the presence of cinnabar or vermillion, probably used together with an organic pigment, in area S5, and an iron-based pigment in area V7. (<b>b</b>) A detail of the ED-XRF spectrum measured in area S5 of the <span class="html-italic">Mystic Marriage of Saint Catherine</span> painting. The peaks relative to the L<sub>α1</sub>, L<sub>β1</sub> and L<sub>γ1</sub> lines of mercury (Hg) are indicated.</p>
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<p>Fiber Optics Reflectance Spectroscopy (FORS) spectra measured in the following areas: (<b>a</b>) areas S6 (black curve) and S7 (blue curve) of the <span class="html-italic">Mystic Marriage of Saint Catherine</span> painting; (<b>b</b>) areas V8 (red curve) and V9 (orange curve) of the <span class="html-italic">Madonna of the Rose Garden</span> painting. The FORS spectra measured in S6 and V9 areas suggest the presence of green earth, while the ones measured in areas S7 and V8 suggest the presence of umber earth.</p>
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<p>(<b>a</b>) Fiber Optics Reflectance Spectroscopy (FORS) spectra measured in areas S8 (black curve) and S9 (blue curve) of the <span class="html-italic">Mystic Marriage of Saint Catherine</span> painting; (<b>b</b>) apparent absorbance calculated for the spectrum S8. The positions of the two maxima in the apparent absorbance spectrum allow us to identify Indian lake.</p>
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<p>Fiber Optics Reflectance Spectroscopy (FORS) spectra measured in the following areas: (<b>a</b>) area S10 of the <span class="html-italic">Mystic Marriage of Saint Catherine</span> painting; (<b>b</b>) areas V11 (red curve) and V12 (orange curve) of the <span class="html-italic">Madonna of the Rose Garden</span> painting. The FORS spectra acquired in areas S10 and V11 suggest the presence of yellow ochre, while in area V12, a mixture of red and yellow ochre is probably present.</p>
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17 pages, 16811 KiB  
Article
Curved Linear Diode Array Imaging of a Historic Anchor Recovered from East Anglia ONE Offshore Wind Farm
by Brandon Mason, James Finch, Sarah Paynter, Heather Anderson and Lauren Nagler
Heritage 2024, 7(5), 2552-2568; https://doi.org/10.3390/heritage7050122 - 16 May 2024
Viewed by 1039
Abstract
The Industrial Metrology Business Unit of Nikon Corporation, on behalf of ScottishPower Renewables and Maritime Archaeology (MA), Southampton, UK, has employed X-ray CT (computed tomography) to visualise the internal structure of an anchor found in the North Sea. The non-destructive method of internal [...] Read more.
The Industrial Metrology Business Unit of Nikon Corporation, on behalf of ScottishPower Renewables and Maritime Archaeology (MA), Southampton, UK, has employed X-ray CT (computed tomography) to visualise the internal structure of an anchor found in the North Sea. The non-destructive method of internal inspection and measurement has helped to determine approximately when it was made. The results indicate that the artefact, initially thought to be potentially Roman, is probably more recent, likely dating to between the late 16th and early 17th centuries CE. This paper presents the discovery, recovery, analysis and interpretation of a significant find from a UK offshore wind farm and underscores the valuable role that non-destructive X-ray CT played in the investigation. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>Anchor WTG_D_154 on the seabed within East Anglia ONE offshore wind farm developed by ScottishPower Renewables.</p>
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<p>Original location of WTG_D_154 within East Anglia ONE offshore wind farm.</p>
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<p>Anchor WTG_D_154, represented as a 3D textured mesh following rapid photogrammetry on deck prior to seabed relocation. Scales are 1 m (vertical) and 2 m (horizontal) in length.</p>
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<p>Anchor WTG_D_154 arrives safely on the deck of <span class="html-italic">Glomar Wave</span> following a recovery operation lasting several hours in June 2021.</p>
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<p>Drawing of the iron anchor excavated at Bulbury Camp by Edward Cunnington, 1881 (Reprinted with permission from Dorset Natural History and Archaeological Society, 1884).</p>
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<p>Anchor WTG_D_154 partially de-concreted during a conservation programme undertaken by Mary Rose Archaeological Services (Image used with permission from Mary Rose Trust, 2022).</p>
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<p>Positioning the anchor on a wooden frame within the Nikon C2 X-ray CT system.</p>
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<p>The usual set up for a circular CT scan, with an X-ray cone beam targeting the flat panel detector comprising the scintillator (green) and the TFT-diode array (blue).</p>
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<p>The usual set up for a CLDA CT scan. The source has been collimated to produce a fan beam, and the detector is collimated to reject any scattered X-rays.</p>
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<p>Cross-sectional view of the shaft from the circular CT scan. The shank sections are approximately 80 mm wide and 90 mm tall.</p>
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<p>Axial slice through the height of the scanned section of shank. A substantial central air channel can be seen. The height of the dataset shown is 170 mm.</p>
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<p>Cross-sectional view of the CLDA scan. The shank sections appear to be constructed of individual units that are joined together. Slices are different distances from the datum height (106.3 cm) on the shaft, from left to right: 7.5, 37.5 and 157.5 mm.</p>
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<p>Detail of the upper face of the surviving arm of WTG_D_154 following disconcertion, indicting the likely presence of a fluke joined above the bend of the segmented final section.</p>
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<p>Two-dimensional profile of the X-ray and detector setup where D is the source to detector distance, and L is the height of the detector that is illuminated. The flat panel detector comprises the scintillator (green) and the TFT-diode array (blue).</p>
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<p>The detector has been moved to twice the distance from the X-ray source.</p>
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<p>The triangles used for calculating the new intensity of the beam.</p>
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20 pages, 4871 KiB  
Article
Recent Applications of Unilateral NMR to Objects of Cultural Heritage
by Valeria Di Tullio and Noemi Proietti
Heritage 2024, 7(5), 2277-2295; https://doi.org/10.3390/heritage7050108 - 29 Apr 2024
Viewed by 883
Abstract
Although nuclear magnetic resonance (NMR) is recognized as a powerful tool in many areas of research, among the investigative techniques used in the field of cultural heritage its application is still largely unknown. One of the reasons for this is that artifacts are [...] Read more.
Although nuclear magnetic resonance (NMR) is recognized as a powerful tool in many areas of research, among the investigative techniques used in the field of cultural heritage its application is still largely unknown. One of the reasons for this is that artifacts are complex heterogeneous systems whose analysis requires a multi-disciplinary approach. In addition, major drawbacks in the analysis of objects belonging to cultural heritage are their limited quantity, number of samples collected from the artifact, and their immovability. Consequently, a methodological approach where non-destructive, and possibly non-invasive techniques are used, is advisable. In recent years, thanks to the development of portable instruments, there has been an increasing use of the NMR methodology in the cultural heritage field. The use of portable NMR has allowed us to study several materials in the cultural heritage, such as frescoes, stones, wood, paper, and paintings, to address the challenges in monitoring dampness in historical masonries, to evaluate the penetration depth of a hydrophobic treatment into a porous material, and to study of the effect of cleaning procedures on artifacts. In this paper, recent studies illustrating the potential of NMR portable methodologies in this field of research are reported. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>(<b>a</b>) U-shaped unilateral NMR sensor by Bruker Biospin; (<b>b</b>) unilateral NMR sensor by Magritek. The sensor is placed on a lift that allows one to move the magnetic field inside the object to be analyzed with micrometric steps.</p>
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<p>Surface degradation due to deposit of hygroscopic salts.</p>
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<p>(<b>a</b>) The blue box shows the area of the apse in the church of “San Nicola in Carcere”, analyzed by NMR unilateral sensor; (<b>b</b>) portable NMR during the acquisition; (<b>c</b>) Humidity map recorded by unilateral NMR at the depth of 3 mm of the San Nicola apse. The legend provides the humidity content range (%) obtained by calibrating the NMR signal.</p>
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<p>(<b>a</b>) Area (yellow circled) investigated by unilateral NMR sensors in the Greek Chapel, in the Catacombs of Priscilla, Rome; (<b>b</b>) Humidity maps recorded by NMR sensors at a depth of 5 mm from the surface in July 2022 (left) and in March 2023 (right), respectively. The legend provides the humidity content range (%) obtained by calibrating the NMR signal.</p>
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<p>(<b>a</b>) Unilateral NMR instruments during the acquisition of a spin echo signal on the left pillar of Brancacci’s Chapel decorated with the “Cacciata” scene; (<b>b</b>) Humidity maps recorded by NMR at a depth of 1 mm from the surface in November 2022 (left) and in April 2023 (right), respectively. The legend provides the humidity content range (%) obtained by calibrating the NMR signal.</p>
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<p>(<b>a</b>) Surface image 538, the letters indicate the measuring points. (<b>b</b>) <sup>1</sup>H NMR profiles obtained on the areas: NL—Glossy black area; Nr—Black area, repainted; N1—Matt black area without repainting; N2—Matt black area without repainting. (<b>c</b>) <sup>1</sup>H NMR profiles obtained on orange zone A.</p>
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<p>(<b>a</b>) image of painting 553; (<b>b</b>) profiles <sup>1</sup>H NMR on painting 553, obtained on the areas: B1—white on the frame, B2—white; and R—red.</p>
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<p>(<b>a</b>) Image of painting 207 with the areas analyzed with the NMR stratigraphy; (<b>b</b>) <sup>1</sup>H NMR profiles obtained on the C-celestial area areas; V green area; B white area; (<b>c</b>) comparisons of the <sup>1</sup>H NMR profiles obtained on the green area and on the opaque black area superimposed on the green area; (<b>d</b>) comparisons of the <sup>1</sup>H NMR profiles obtained on the white area and on the opaque black area superimposed on the white area, Nb.</p>
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<p>Top left shows an image of painting Catrame with the areas analyzed with the NMR stratigraphy is shown. The other graphs show the <sup>1</sup>H NMR profile of points P6, P16, and P5. In abscissa is shown the thickness/depth (depth) of scanning expressed in micrometers (μm), in ordinate is reported the signal NMR (arbitrary units) indicating the hydrogen content of the different layers constituting the painting. Above is a graphic diagram that suggests the possible correlation between the stratigraphy of the painting and the stratigraphic profile NMR.</p>
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<p>Comparison of distributions of T<sub>2</sub> in the Sabucina Stone before and after artificial aging. (<b>a</b>) untreated sample (NT); (<b>b</b>) sample aged for 8 cycles aging sample; and (<b>c</b>) sample aged for 14 cycles. The distribution of T<sub>2</sub> was obtained by averaging and fitting the signal of the transverse component of the magnetization acquired at depths of 1000, 700, and 400 μm from the surface of the sample.</p>
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<p>Distributions of T<sub>2</sub> obtained by acquiring the NMR signal (RF 20 MHz) under a homogeneous magnetic field (Minispec MQ-Bruker-sample dimension 10 mm) and an inhomogeneous magnetic field (portable NMR-Magritek).</p>
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22 pages, 12590 KiB  
Article
An Archaeometric Study of Lead-Glazed Medieval Ceramics (13th–14th Century) from Santarém, Portugal
by L. F. Vieira Ferreira, T. M. Casimiro, C. Boavida, M. F. Costa Pereira and I. Ferreira Machado
Heritage 2024, 7(5), 2217-2238; https://doi.org/10.3390/heritage7050105 - 25 Apr 2024
Cited by 1 | Viewed by 1487
Abstract
Ceramic sherds from approximately 20 samples of lead-glazed tableware, recovered from diverse archaeological sites, including three repurposed storage pits transformed into dumpsters within the medieval city of Santarém (13th–14th century), underwent a meticulous examination. This investigation utilised techniques such as micro-Raman, ground-state diffuse [...] Read more.
Ceramic sherds from approximately 20 samples of lead-glazed tableware, recovered from diverse archaeological sites, including three repurposed storage pits transformed into dumpsters within the medieval city of Santarém (13th–14th century), underwent a meticulous examination. This investigation utilised techniques such as micro-Raman, ground-state diffuse reflectance absorption, and X-ray fluorescence spectroscopies, in addition to X-ray diffraction and stereomicroscopy. A parallel study was conducted on contemporaneous European ceramics (glazed sherds) sourced from archaeological sites dating back to the 13th–15th centuries in Saintonge (France), Ardenne, Zomergem, and Bruges (Belgium), as well as Surrey–Hampshire, Kingston, and Cheam (England). The first premise for comparing the Santarem samples with European production locations was their frequent commercial relations with Portugal and the frequency of these productions being found in Portugal. The colour of the ceramic bodies is predominantly white or whitish, with a few exhibiting a vivid red hue. Analyses of the fabric, mineralogical, and elemental composition of the sherds suggest that the majority of Santarém’s glazed ceramics were locally or regionally produced, potentially derived from a Pliocene kaolin-rich sand formation. However, this conclusion is not supported by the absence of discovered lead glaze kilns or workshops in Santarém for the late Middle Ages. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>Glazed ceramic sherds collected from two storage pits, dated to the 13th–14th centuries, Santarém. S stands for Santarém. Scale bar: 10 mm.</p>
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<p>Glazed ceramic sherds collected from several European archaeological sites dated to the 13th–14th centuries. St—Saintonge; A—Ardenne; Z—Zomergem; B—Bruges; SH—Surrey–Hampshire; K—Kingston; and C—Cheam. Scale bar: 10 mm.</p>
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<p>Map with Santarém and European archaeological sites where all samples were collected.</p>
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<p>Micro-Raman spectra from the most significant glazed surfaces (<b>a</b>) and pastes (<b>b</b>) of the Santarém sherds. Quartz (Q), anatase (A), hematite (H), magnetite (M), carbon black (CB), stretching (υ) and bending (δ) of Raman envelopes.</p>
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<p>Micro-Raman spectra from the most significant glazed surfaces from the European sherds. Quartz (Q), anatase (A), c arbon black (CB), stretching (υ) and bending (δ) of Raman envelopes.</p>
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<p>GSDR absorption spectra of S2 Santarém green and black glaze and ceramic body (<b>a</b>) and S3 Santarém amber glaze and ceramic body (<b>b</b>).</p>
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<p>GSDR absorption spectra of European sherds: (<b>a</b>) St1—Saintonge green glaze; St3—Saintonge yellow glaze; A2—Ardenne cream glaze; Z1—Zomergem brown glaze; (<b>b</b>) B1—Bruges green glaze; SH2—Surrey–Hampshire greenish glaze; K2—Kingston cream glaze; C1—Cheam brownish glaze.</p>
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<p>Representative XRD patterns for ceramic bodies of sherds from Santarém medieval archaeological site, all non-carbonaceous silicious-type pastes. XRD peaks: quartz (Q), anatase (A), rutile (R), muscovite (M), and microcline (Mic). (All diffractograms were normalised to the quartz peak at 2θ<sup>0</sup> = 21.0 (constant intensity), to allow comparisons of the relative amounts of all the other minerals).</p>
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<p>Scatterplot of Al/Si versus Ca/Si count ratios for the studied ceramic. The contents of Al and Ca measured by XRF were normalised to the Si content [<a href="#B35-heritage-07-00105" class="html-bibr">35</a>]. Green ellipse—light coloured pastes with lower quartz temper. Blue ellipse—light, reddish, and grey brownish pastes with higher quartz temper.</p>
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<p>Selection of representative Santarém (S1, Santarém), and European red (Bruges—Belgium B1, B2, B3) and grey–brown (Zomergem Z1, Z2) fabric pastes. Scale bar: 1 mm.</p>
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<p>Scatterplot of PbO versus SiO<sub>2</sub> for glazed surfaces of Santarém and European samples.</p>
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<p>Selection of representative Santarém and European fabric pastes. From top to bottom, quartz temper increases. From left to right, feldspar slightly increases (Na-Ca plagioclase).</p>
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<p>Selection of representative Santarém (S2—Santarém) and European (B3—Bruges—Belgium) red combined fabric pastes. Scale bar: 1 mm.</p>
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14 pages, 16329 KiB  
Article
Rediscovering the Painting Technique of the 15th Century Panel Painting Depicting the Coronation of the Virgin by Michele di Matteo
by Chiara Delledonne, Michela Albano, Tommaso Rovetta, Gianmarco Borghi, Mario Gentile, Anna Denia Marvelli, Piero Mezzabotta, Lucia Riga, Elisa Salvini, Marta Trucco, Francesca Volpi and Giacomo Fiocco
Heritage 2024, 7(1), 324-337; https://doi.org/10.3390/heritage7010016 - 10 Jan 2024
Viewed by 2022
Abstract
The study concerned a diagnostic spectroscopic campaign carried out on the panel painting depicting the Coronation of the Virgin (first half of the 15th century) by the late-Gothic Italian painter Michele di Matteo. The main aims were the identification of the original painting [...] Read more.
The study concerned a diagnostic spectroscopic campaign carried out on the panel painting depicting the Coronation of the Virgin (first half of the 15th century) by the late-Gothic Italian painter Michele di Matteo. The main aims were the identification of the original painting materials and the characterization of the painter’s artistic technique. A combined approach based on non- and micro-invasive techniques was employed. Visible and ultraviolet-induced fluorescence photography was used to select the areas of interest for spectroscopic analyses; X-ray radiography assessed the state of conservation of the support, while X-ray fluorescence and external reflection Fourier transform infrared spectroscopies allowed the chemical identification of pigments, binders, and varnishes. Attenuated total reflection infrared spectroscopy, optical microscopy, and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy were used to visualize and characterize the materials in the pictorial layers. The results highlighted the presence of pigments, possibly applied with an egg binder, consistent with the period of the production of the painting, as well as modern pigments used during subsequent restorations: an imprimitura with lead white and a gypsum-based ground layer. Concerning the gilding, the guazzo technique was confirmed by identifying a red bolo substrate and gold leaf. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>Photography in VIS light of the (<b>a</b>) front and (<b>b</b>) back of the painting <span class="html-italic">Coronation of the Virgin</span> (92 × 72 × 2.5 cm) by Michele di Matteo. Enlarged details of the cracks in the painting layers in correspondence with (<b>c</b>) Christ’s mantle and (<b>d</b>) the golden background and halos.</p>
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<p>(<b>a</b>) UVIF image of the panel painting <span class="html-italic">Coronation of the Virgin</span>. (<b>b</b>) Visible image of the panel where ER-FTIR analytical spots (green squares), XRF spots (red squares) and micro-sampling areas (light blue squares) are highlighted.</p>
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<p>RX of the painting where the presence of cracks (green arrows), previous xylophagous attacks (red arrows), stucco (yellow arrows), and canvas (blue arrows) are highlighted.</p>
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<p>(<b>a</b>) XRF spectrum (spot 9 in <a href="#heritage-07-00016-f002" class="html-fig">Figure 2</a>b, red square). (<b>b</b>) ER-FTIR pseudo-absorbance and KKT spectra (spot 14 in <a href="#heritage-07-00016-f002" class="html-fig">Figure 2</a>b, green square) of the blue area of the Virgin’s mantle over her head.</p>
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<p>ER-FTIR pseudo-absorbance spectrum (spot 9 in <a href="#heritage-07-00016-f002" class="html-fig">Figure 2</a>b, green square) of the white area of the throne structure.</p>
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<p>Comparison of XRF spectra collected (<b>a</b>) on the red areas of the (1) Virgin’s dress (spot 16 in <a href="#heritage-07-00016-f002" class="html-fig">Figure 2</a>-b, red square) and (2) pillow (spot 20 in <a href="#heritage-07-00016-f002" class="html-fig">Figure 2</a>b, red square), and (<b>b</b>) on the flesh tone areas of the Virgin’s (3) cheeks and (4) lips (spots 5 and 6 in <a href="#heritage-07-00016-f002" class="html-fig">Figure 2</a>b, red squares) and (5) Virgin’s neck (spot 7 in <a href="#heritage-07-00016-f002" class="html-fig">Figure 2</a>b, red square).</p>
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<p>Cross-section of sample 2 of the area of the golden background (area 2 in <a href="#heritage-07-00016-f002" class="html-fig">Figure 2</a>b, light blue square) observed under (<b>a</b>) the OM in VIS light (left) and UVIF (right), and (<b>b</b>) the SEM-EDS. The cross-section shows the ground layer (A), <span class="html-italic">bolo</span> layer (B), and gold leaf (C).</p>
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<p>(<b>a</b>) SEM-EDS and (<b>b</b>) ATR-FTIR spectra acquired in correspondence of the ground layer A and gilding preparation layer B, left and right, respectively.</p>
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11 pages, 2180 KiB  
Article
The High Potential of Micro-Magnetic Resonance Imaging for the Identification of Archaeological Reeds: The Case Study of Tutankhamun
by Claudia Moricca, Valeria Stagno, Nagmeldeen Morshed Hamza, Gabriele Favero, Laura Sadori and Silvia Capuani
Heritage 2023, 6(11), 7170-7180; https://doi.org/10.3390/heritage6110375 - 16 Nov 2023
Viewed by 1928
Abstract
This study explores the potential of micro-magnetic resonance imaging (μ-MRI) for identifying archaeological reeds found in the tomb of Tutankhamun. Reed plants had various historical uses in the past, with ancient Egyptians extensively employing them for crafting a wide range of items. The [...] Read more.
This study explores the potential of micro-magnetic resonance imaging (μ-MRI) for identifying archaeological reeds found in the tomb of Tutankhamun. Reed plants had various historical uses in the past, with ancient Egyptians extensively employing them for crafting a wide range of items. The distinct cross-sectional characteristics of Arundo donax (giant reed) and Phragmites australis (common reed) are observed and described via optical microscopy and μ-MRI in this study. While optical microscopy offers higher resolution, μ-MRI provides advantages for studying archaeobotanical specimens, as it eliminates the need for mechanical sectioning and potentially damaging fragile samples. The application of μ-MRI on a selected archaeological reed allowed us to identify it as Phragmites australis, showing that μ-MRI can yield clear images, maintaining the integrity of the sample. In contrast, diagnostic features appeared greatly deformed on the thin section observed via optical microscopy. Despite the limitations related to the sample size and the need for sample soaking, μ-MRI presents a valuable tool for analyzing archaeological remains in the field of cultural heritage, with the potential for broader applications. Overall, this study contributes to expanding the toolkit available to researchers studying plant remains, providing insights into reed identification and preservation in archaeological contexts. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>Some of the reed fragments found in the wooden box containing the remains swept from the surfaces of Tutankhamun’s tomb.</p>
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<p><span class="html-italic">Arundo donax</span>: (<b>a</b>) thin section observed via optical microscopy; (<b>b</b>) detail on a vascular bundle observed via OM; (<b>c</b>) μ-MRI image of a sample slice; and (<b>d</b>) a zoomed part of the μ-MRI image.</p>
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<p><span class="html-italic">Phragmites australis</span>: (<b>a</b>) thin section observed via optical microscopy; (<b>b</b>) close-up on two vascular bundles observed via OM; and (<b>c</b>) μ-MRI image of a sample slice.</p>
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<p>Archaeological reed fragment, preserved by desiccation, swept from the surfaces of the tomb of Tutankhamun in 1933 and preserved in a box in the Grand Egyptian Museum; (<b>a</b>) thin section observed via optical microscopy; (<b>b</b>) detail of vascular bundle observed via OM; and (<b>c</b>) μ-MRI image.</p>
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21 pages, 6400 KiB  
Article
Integrating Cultural Sites into the Sesia Val Grande UNESCO Global Geopark (North-West Italy): Methodologies for Monitoring and Enhancing Cultural Heritage
by Michele Guerini, Rasool Bux Khoso, Arianna Negri, Alizia Mantovani and Elena Storta
Heritage 2023, 6(9), 6132-6152; https://doi.org/10.3390/heritage6090322 - 27 Aug 2023
Cited by 3 | Viewed by 1474
Abstract
UNESCO Global Geoparks are recognised in the scientific community for their exceptional geological significance, but their potential to embrace and preserve cultural heritage sites is underestimated. This study delves into a pioneering approach within the Sesia Val Grande UNESCO Global Geopark (NW Italy), [...] Read more.
UNESCO Global Geoparks are recognised in the scientific community for their exceptional geological significance, but their potential to embrace and preserve cultural heritage sites is underestimated. This study delves into a pioneering approach within the Sesia Val Grande UNESCO Global Geopark (NW Italy), examining the integration of culturally significant sites into conservation and promotion strategies. To achieve a successful integration, we adapted a methodology used for the identification and assessment of geosites, incorporating the criteria of cultural significance, to assess the value of 10 cultural sites within the geopark and compare the results with the assessment values of 10 geosites. Moreover, we submitted survey questionnaires to geopark tourists to understand their interest in visiting both geosites and cultural sites. The findings reveal the remarkable scientific, educational, and touristic values of these cultural sites, which constitute an important resource for the geopark, to be enhanced and protected together with the geosites. Interestingly, the higher scientific value of cultural sites corresponds to increased visitor interest, which is in contrast to the trend observed for geosites. Through this unified approach, the monitoring of cultural heritage within the geopark is simplified and improved, enabling a comprehensive inventory and efficient administration. Moreover, by aligning visitor interests with scientific value, the Sesia Val Grande Geopark can enhance conservation and sustainable tourism efforts. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>Details of the geographical location of the Sesia Val Grande UNESCO Global Geopark within the Piemonte Region. In grey, the Piemonte Region’s administrative borders are represented. In green, the Sesia Val Grande UNESCO Global Geopark area is indicated. Inside the borders of the geopark, the areas belonging to the Natura 2000 network are indicated with different colours.</p>
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<p>The 10 geosites that are considered in this paper: (<b>a</b>) Balmuccia Peridotite along the Sesia River (photo by Ilaria Selvaggio); (<b>b</b>) view of Cimalegna plateau (photo by Marco Giardino); (<b>c</b>) Albo church (photo from Francoerbi Wikimedia Commons); (<b>d</b>) the marbles from Candoglia quarry (photo by Giorgio Pallavicini); (<b>e</b>) view of Mount Rosa glaciers; (<b>f</b>) kinzigitic rocks near the Varallo Sacred Mountain; (<b>g</b>) Kreas gold mines of Mount Rosa; (<b>h</b>) Otro Valley (photo from BelPatty86 Wikimedia Commons); (<b>i</b>) outcrop of mylonite in Val Pogallo (photo by Lorenzo Rasini); and (<b>j</b>) example of soapstone (photo by Gian Mario Navillod).</p>
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<p>The 10 cultural sites that are considered in this paper: (<b>a</b>) church of the Ghiffa sacred mountain (photo by Raffaele Pagani); (<b>b</b>) view of Varallo Sacred Mountain; (<b>c</b>) mountaineers climbing to Capanna Margherita Hut (photo by Carlo Zanetta); (<b>d</b>) Walser villages near Alagna Valsesia (photo from BelPatty86 Wikimedia Commons); (<b>e</b>) view of Vogogna Castle (photo by Rmenzaghi); (<b>f</b>) botanical gardens of Villa Taranto; (<b>g</b>) Mount Fenera Ciota Ciara cave (photo by Claudio Berto); (<b>h</b>) Candoglia quarry (photo by Giulia Varetti); (<b>i</b>) Villa Caccia in Romagnano Sesia; (<b>j</b>) Val Grande petroglyphs from which the logo of the park is inspired (photo by Carlo Zanetta).</p>
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<p>Map of the geographical locations of the geosites and cultural sites within the Sesia Val Grande UNESCO Global Geopark. Blue dots represent the geosites. Red dots represent the cultural sites. Purple dots indicate the sites in which it is possible to consider both geosites and cultural sites. The dimension of the spot in the table indicates the scientific value assessed for each site.</p>
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<p>Average scores for the selected geosites. SV: scientific value; EV: potential educational use; TV: potential touristic use; DR: degradation risk. The description of the geosites is reported in <a href="#heritage-06-00322-t001" class="html-table">Table 1</a>. An extensive table containing information on geosites is reported in <a href="#app1-heritage-06-00322" class="html-app">Supplementary Material</a> (<a href="#app1-heritage-06-00322" class="html-app">Table S1</a>).</p>
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<p>Average scores for the selected cultural sites. SV: scientific value; EV: potential educational use; TV: potential touristic use; DR: degradation risk. An extensive table containing information on cultural sites is reported in <a href="#app1-heritage-06-00322" class="html-app">Supplementary Material</a> (<a href="#app1-heritage-06-00322" class="html-app">Table S1</a>).</p>
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<p>Participants’ level of interest in geopark geosites. In green are the values from 1 to 5, where 1 means “I do know it, but I am slightly interested in visit the geosite”, and 5 means “I am strongly interested in visiting the geosite”. In red is the 0 value that corresponds to “I do not know the geosite and I am not interested in visiting it”.</p>
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<p>Participants’ level of interest in geopark cultural sites. In green are the values from 1 to 5, where 1 means “I do know it, but I am slightly interested in visit the site” and 5 means “I am very interested in visiting the site”. In red is the 0 value that corresponds to “I do not know the site and I am not interested in visiting it”.</p>
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<p>(<b>a</b>) Expert evaluation on the scientific value of geosites correlated with the average values of the touristic interest in geosites. (<b>b</b>) Expert evaluation on the scientific value of cultural sites correlated with the average values of the touristic interest in cultural sites. In both figures, the <span class="html-italic">x</span>-axis indicates the values of the scientific assessment, and the <span class="html-italic">y</span>-axis indicates the values of the touristic interest. According to the questionnaire (<a href="#app1-heritage-06-00322" class="html-app">Table S2</a>), the touristic interest ranges from 0 (I do not know it and I am not interested in visiting it) to 5 (I am strongly interested in visiting it).</p>
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<p>Participant preferences on the importance of protecting and promoting of geosites vs. cultural sites. Negative values indicate the protection or promotion of the geosites. Positive values indicate the promotion and protection of cultural sites. A value of 0 indicates the equal importance in protecting and promoting geosites and cultural sites.</p>
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19 pages, 27647 KiB  
Article
Structured-Light Scanning and Metrological Analysis for Archaeology: Quality Assessment of Artec 3D Solutions for Cuneiform Tablets
by Filippo Diara
Heritage 2023, 6(9), 6016-6034; https://doi.org/10.3390/heritage6090317 - 24 Aug 2023
Cited by 5 | Viewed by 1970
Abstract
This paper deals with a metrological and qualitative evaluation of the Artec 3D structured-light scanners: Micro and Space Spider. As part of a larger European project called ITSERR, these scanners are tested to reconstruct small archaeological artefacts, in particular cuneiform tablets with different [...] Read more.
This paper deals with a metrological and qualitative evaluation of the Artec 3D structured-light scanners: Micro and Space Spider. As part of a larger European project called ITSERR, these scanners are tested to reconstruct small archaeological artefacts, in particular cuneiform tablets with different dimensions. For this reason, Micro and Space Spider are compared in terms of the entire workflow, from preparatory work to post-processing. In this context, three cuneiform replica tablets will serve as examples on which the Artec scanners will have to prove their worth. Metric analyses based on distance maps, RMSe calculations and density analyses will be carried out to understand metrological differences between these tools. The creation of 3D models of cuneiform tablets is the first step in developing a virtual environment suitable for sharing the archaeological collection with collaborators and other users. The inclusion of semantic information through specific ontologies will be the next step in this important project. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>Schematic operative workflow applied to this research analysis: from preliminary steps to post-processing procedures.</p>
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<p>Schematic representation of structured-light scanning operation: trigonometric triangulation between the object, the camera and the light source. The scanner calculates the triangulation angle α and light deformation on the object.</p>
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<p>The tested structured-light scanners: (<b>A</b>) Artec Micro; (<b>B</b>) Artec Space Spider.</p>
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<p>Cuneiform replica tablet considered for this analysis: (<b>A</b>) lenticular tablet from UPM, diameter 70 mm, max-thickness 27 mm; (<b>B</b>) rectangular tablet from UPM, length 35 mm, width 30 mm, thickness 16 mm; (<b>C</b>) squared tablet, length 25 mm, width 25 mm, thickness 9 mm.</p>
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<p>3D model of the lenticular tablet created with Artec Micro: 3D resolution 0.03 mm.</p>
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<p>3D model of the lenticular tablet created with Artec Space Spider: 3D resolution 0.08 mm.</p>
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<p>Details of 3D models related to the lenticular tablet created with Artec Micro (<b>A</b>) and Space Spider (<b>B</b>). Here can be noticed differences between 3D resolutions: 0.03 mm and 0.08 mm.</p>
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<p>3D model of the rectangular tablet created with Artec Micro: 3D resolution 0.03 mm.</p>
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<p>3D model of the rectangular tablet created with Artec Space Spider: 3D resolution 0.08 mm.</p>
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<p>Details of 3D models related to the rectangular tablet created with Artec Micro (<b>A</b>) and Space Spider (<b>B</b>). Here can be noticed differences between 3D resolutions: 0.03 mm and 0.08 mm.</p>
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<p>3D model of the squared tablet created with Artec Micro: 3D resolution 0.03 mm.</p>
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<p>3D model of the rectangular tablet created with Artec Space Spider: 3D resolution 0.08 mm.</p>
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<p>Details of 3D models related to the squared tablet created with Artec Micro (<b>A</b>) and Space Spider (<b>B</b>). Here can be noticed differences between 3D resolutions: 0.03 mm and 0.08 mm.</p>
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<p>Texture diffuse mapping: Micro models (<b>A</b>–<b>C</b>); Space Spider models (<b>D</b>–<b>F</b>).</p>
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<p>Lenticular tablet. Comparison between two different outputs: (<b>A</b>) Micro model; (<b>B</b>) Spider model; (<b>C</b>) two models aligned and registered (models overlapped, error 0.001 mm).</p>
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<p>Lenticular tablet. Distance Map (mesh to mesh) between Micro and Spider models: maximum distance (error scale) 0.250 mm; absolute distance 0.012 mm; RMSe 0.017 mm.</p>
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<p>Rectangular tablet. Comparison between two different outputs: (<b>A</b>) Micro model; (<b>B</b>) Spider model; (<b>C</b>) two models aligned and registered (models overlapped, error 0.001 mm).</p>
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<p>Rectangular tablet. Distance Map (mesh to mesh) between Micro and Spider models: maximum distance (error scale) 0.200 mm; absolute distance 0.039 mm; RMSe 0.031 mm.</p>
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<p>Rectangular tablet. Comparison between two different outputs: (<b>A</b>) Micro model; (<b>B</b>) Spider model; (<b>C</b>) two models aligned and registered (models overlapped, error 0.001 mm).</p>
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<p>Rectangular tablet. Distance Map (mesh to mesh) between Micro and Spider models: maximum distance (error scale) 0.200 mm; absolute distance 0.023 mm; RMSe 0.022 mm.</p>
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<p>Micrometric details of 3D cuneiform tablet. Zoom and metric evaluation of Micro (brown) and Space Spider (blue) models: lenticular tablet (<b>A</b>,<b>D</b>); Rectangular tablet (<b>B</b>,<b>E</b>); squared tablet (<b>C</b>,<b>F</b>).</p>
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<p>Lenticular replica tablet. Post-processing render and shader filters. Micro model: (<b>A</b>) rendered depth map, (<b>B</b>) dimple shader with custom light direction, (<b>C</b>) shader related to the radiance inverted map. Spider model: (<b>D</b>) rendered depth map, (<b>E</b>) dimple shader with custom light direction, (<b>F</b>) shader related to the radiance inverted map.</p>
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<p>Rectangular replica tablet. Post-processing render and shader filters. Micro model: (<b>A</b>) rendered depth map, (<b>B</b>) dimple shader with custom light direction, (<b>C</b>) shader related to the radiance inverted map. Spider model: (<b>D</b>) rendered depth map, (<b>E</b>) dimple shader with custom light direction, (<b>F</b>) shader related to the radiance inverted map.</p>
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<p>Squared replica tablet. Post-processing render and shader filters. Micro model: (<b>A</b>) rendered depth map, (<b>B</b>) dimple shader with custom light direction, (<b>C</b>) shader related to the radiance inverted map. Spider model: (<b>D</b>) rendered depth map, (<b>E</b>) dimple shader with custom light direction, (<b>F</b>) shader related to the radiance inverted map.</p>
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<p>Schematic analysis on polygons (triangles) count (million) for each cuneiform tablet.</p>
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<p>Graphic schema on density ratio related to polygons per mm<sup>3</sup> for each cuneiform tablet.</p>
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<p>Schematic analysis RMSe related to distance map Micro/Space Spider for each cuneiform tablet.</p>
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12 pages, 6676 KiB  
Article
R.A.O. Project Recovery: Methods and Approaches for the Recovery of a Photographic Archive for the Creation of a Photogrammetric Survey of a Site Unreachable over Time
by Vittorio Lauro, Marco Giovannangelo, Mariella De Riggi, Nicola Lanzaro and Vittorio Murtas
Heritage 2023, 6(6), 4710-4721; https://doi.org/10.3390/heritage6060250 - 7 Jun 2023
Viewed by 1434
Abstract
The goal of this research is to make photogrammetric surveys of the walls of Cortona from 2012 accessible using new methodologies for recovering photographic material. This will allow a team of archaeologists to carry out a virtual reconnaissance of the surveyed stretch of [...] Read more.
The goal of this research is to make photogrammetric surveys of the walls of Cortona from 2012 accessible using new methodologies for recovering photographic material. This will allow a team of archaeologists to carry out a virtual reconnaissance of the surveyed stretch of wall as well as provide the basis for future investigations into any potential changes that may have occurred in the wall since 2012. Photogrammetry is a widely used technique in archaeology that can help researchers accurately measure, reconstruct, and analyze different architectural components of the wall. By using state-of-the-art photogrammetric techniques, including advanced computer vision algorithms, our team aims to produce high-quality 3D models and accurate measurements of different parts of the wall. The results of this research project will enable archaeologists to gain a more comprehensive understanding of the layout of the fortifications and the role of the Cortonese walls in the historical context of the area. Additionally, the research project will provide a detailed documentation of the wall that will be useful for both archaeological researchers and cultural heritage organizations. Finally, the research project will also provide the basis for future investigations into potential changes that may have occurred in the wall since 2012, which will be important for monitoring conservation and restoration efforts and providing an up-to-date record of the wall’s state of preservation. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>Representation of Cortona as reported by Aldo Neppi Modona, Cortona: Etruscan and Roman history and art.</p>
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<p>Illustration of the city by Pietro da Cortona cit. in bibliography.</p>
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<p>Map of Cortona with processed city-wall sectors and its city-gates; Basemap: © Bing Aerial, 2018.</p>
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<p>Map of Cortona with processed city-wall sectors, city-gates and contour lines; Basemap: © Bing Aerial, 2018.</p>
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<p>Map of Cortona and remains of Etruscan masonry present in the investigated area; Basemap: © Bing Aerial, 2018.</p>
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<p>Virtual platforms to visit the upper parts of the walls.</p>
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18 pages, 10346 KiB  
Article
Non-Destructive Identification and Characterization of Crystopal, A Novel Mid-Twentieth Century Plastic
by Mary N. Boyden, Courtney K. Hicks and Timothy M. Korter
Heritage 2023, 6(5), 4102-4119; https://doi.org/10.3390/heritage6050216 - 3 May 2023
Viewed by 1581
Abstract
Crystopal is a mechanically strong yet highly decorative plastic with a translucent and crackled appearance that was produced in the 1960s by the artist and plastics engineer Armand G. Winfield (1919–2009) and his company, Crystopal, Ltd. Many of Winfield’s collected plastic objects are [...] Read more.
Crystopal is a mechanically strong yet highly decorative plastic with a translucent and crackled appearance that was produced in the 1960s by the artist and plastics engineer Armand G. Winfield (1919–2009) and his company, Crystopal, Ltd. Many of Winfield’s collected plastic objects are housed within the Syracuse University Libraries, but some lack complete archival descriptions, including plastic compositions. To address this, the non-invasive and non-destructive determination of the polymer identities in Winfield’s artifacts was performed by Raman spectroscopy. Our studies generally begin with the database matching of an artifact spectrum to that of a polymer standard, but when objects known to be fabricated from Crystopal were analyzed, a database of over 100 representative polymers failed to yield the chemical identity of the plastic. However, the Raman spectrum of Crystopal displayed a unique chemical fingerprint that revealed it to be composed of an unsaturated polyester crosslinked with styrene. This Raman spectrum was added to the database and used as reference for the unambiguous identification of Crystopal artifacts, distinguishing them from decorative plastics with similar appearances. The addition of Crystopal to the polymer database provides a pathway toward establishing artifact provenance and preserving objects crafted from this unique and decorative plastic. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>Comparison of Raman spectra for Artifact A, Artifact B, and references ST/AA, PCL, and PET.</p>
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<p>Raman spectra of Artifacts C, D, and E.</p>
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<p>Raman Spectra of Artifacts F, G, H, I, and J. Peaks marked with “*” originate from phthalocyanine green in Artifact F.</p>
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<p>Raman spectra of Artifacts K–M. Peaks marked with “*” originate from phthalocyanine green in Artifact F.</p>
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<p>Raman spectra of Artifacts N consisting of six bulb-shaped objects with varying colors.</p>
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24 pages, 7008 KiB  
Article
Computed Tomography Analysis of the Manufacture of Cast Head-Bust Figurines by Patricia ‘Pat’ Elvins (1922–2011)
by Dirk H. R. Spennemann and Clare L. Singh
Heritage 2023, 6(2), 2268-2291; https://doi.org/10.3390/heritage6020120 - 20 Feb 2023
Viewed by 1719
Abstract
The Alice Springs sculptor Patricia Elvins created a number of busts of Indigenous Australian men, women, and children, which were distributed as casts for the gift and souvenir market. Produced between the early-1960s and the early-1990s, these varnished casts exist with four different [...] Read more.
The Alice Springs sculptor Patricia Elvins created a number of busts of Indigenous Australian men, women, and children, which were distributed as casts for the gift and souvenir market. Produced between the early-1960s and the early-1990s, these varnished casts exist with four different artists’ signatures, representing collaboration with different production potters who produced the casts. Macroscopic analysis shows significant differences in weight between casts of the same bust. CT scanning was carried out to understand the make-up of these casts and to illuminate differences in production techniques. The scanning revealed that all figurines were cast, but that casting techniques varied not only between production potters but also among figurines of the same potter. It revealed differences in the densities of the casting material, both between and within specimens, suggesting that production was not standardized but occurred in smaller batches, possibly on demand of low-volume sales stock. The study has shown the potential of non-destructive CT scanning to go beyond this and serve as a tool to examine the casting process itself as well as to contribute to an understanding of the nature of the plasters used. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>Figurine of a male elder by Pat Elvins. Shown is specimen OMB1. For dimensions, see <a href="#heritage-06-00120-t001" class="html-table">Table 1</a>.</p>
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<p>Figurine of a male elder by Pat Elvins. Shown is specimen OMB1. For dimensions, see <a href="#heritage-06-00120-t001" class="html-table">Table 1</a>.</p>
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<p>Figurine of a female elder by Pat Elvins. Shown is specimen OWB1. For dimensions, see <a href="#heritage-06-00120-t001" class="html-table">Table 1</a>.</p>
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<p>Figurine of a female elder by Pat Elvins. Shown is specimen OWB1. For dimensions, see <a href="#heritage-06-00120-t001" class="html-table">Table 1</a>.</p>
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<p>Terminology used for the description of Computed Tomography scans of the figurines. (<b>a</b>) Coronal plane; (<b>b</b>) sagittal plane, (<b>c</b>) transverse plane; (<b>d</b>) definitions for the endpoint of the planes.</p>
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<p>Specimen OMB2. Sagittal plane (<b>left</b>) and coronal plane (<b>right</b>). (a) Less dense matrix along occipital and right parietal part (1473 ± 548 HU); (b) main matrix (1555 ± 557). The scale bar represents 10 mm.</p>
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<p>Specimen OME1. Sagittal plane (<b>left</b>) and coronal plane (<b>right</b>). (a) Less dense matrix along occipital and right parietal part (1321 ± 523 HU); (b) main matrix (1329 ± 506). The scale bar represents 10 mm.</p>
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<p>Specimen OMM1. Coronal plane, slices 118/238 (<b>left</b>) and 139/238 (<b>right</b>). (a) Denser matrix along the right occipital area of the figurine (1260 ± 309 HU); (b) main matrix (899 ± 334 HU); (c) inclusion of denser matrix, 3 × 14 mm (1604 ± 523 HU); (d) defined area of same matrix as the majority of the head, 5–9 × 29 mm (899 ± 325 HU); (e) denser matrix at the base (1014 ± 226 HU); (f) trapped air bubble 3 × 6 mm (−1062 ± 416 HU). The scale bar represents 10 mm.</p>
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<p>Specimen OMM1. Sagittal plane (<b>left</b>) and transverse plane (<b>right</b>). (a) Denser matrix along the frontal area of the figurine; (b) main matrix; (c) inclusion of denser matrix; (d) defined area of same matrix as the majority of the head; (e) denser matrix at the base. The scale bar represents 10 mm.</p>
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<p>Specimen OMM3. Sagittal plane (<b>left</b>) and coronal plane (<b>right</b>). (a) Denser matrix along the frontal area of the figurine (971 ± 202 HU); (b) main matrix (533 ± 134 HU); (c) well-defined inclusions of denser matrix (1113 ± 227 HU); (d) banding in a deep convex shape (960 ± 211 HU); (e) amorphous inclusion of denser matrix (1119 ± 154 HU). The scale bar represents 10 mm.</p>
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<p>Specimen OMP1. (<b>a</b>) Sagittal plane; (<b>b</b>) coronal plane; (<b>c</b>) transverse plane of interface between the two matrices, slice toward the proximal end of the head; (<b>d</b>) transverse plane of interface between the two matrices, slice toward the distal end of the head. The scale bar represents 10 mm.</p>
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<p>Specimen OWM1. Sagittal plane (<b>left</b>) and coronal plane (<b>right</b>). (a) Denser matrix along the parietal area of the figurine (1586 ± 301 HU); (b) main matrix (998 ± 404 HU). The scale bar represents 10 mm.</p>
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<p>Weighted averages (with standard deviations) of the Hounsfield units of the control targets and the main and edge matrices of the specimens examined in this study.</p>
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<p>Seriation of weighted averages (with standard deviations) of the Hounsfield units of the control targets and the main matrices of the specimens examined in this study. The shaded area encompasses all samples where the density of the main matrix does not differ significantly from that of control sample DP (dental plaster).</p>
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<p>Seriation of weighted averages (with standard deviations) of the Hounsfield units of the control targets and the main matrices of the specimens examined in this study. The shaded area encompasses all samples where the density of the main matrix does not differ significantly from that of control sample PL (Plaster of Paris).</p>
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<p>Seriation of weighted averages (with standard deviations) of the Hounsfield units of the control targets and the main matrices of the specimens examined in this study. The shaded area encompasses all samples where the density of the edge matrix does not differ significantly from that of the control sample DP (dental plaster).</p>
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<p>Three-dimensional scatter plot of volume weight and average Hounsfield Units of male figurines. Scatterplot generated with MiaBella online visualization.</p>
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<p>Three-dimensional scatter plot of volume weight and average Hounsfield Units of female figurines. Scatterplot generated with MiaBella online visualization.</p>
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Review

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19 pages, 3236 KiB  
Review
A Closer Look at Heritage Systems from Medieval Colors to Modern and Contemporary Artworks
by Maria J. Melo, Márcia Vieira, Paula Nabais, Artur Neves, Marisa Pamplona and Eva Mariasole Angelin
Heritage 2024, 7(10), 5476-5494; https://doi.org/10.3390/heritage7100259 - 3 Oct 2024
Viewed by 647
Abstract
This microreview, conducted by interdisciplinary teams, examines complex heritage material systems, such as medieval colors and modern and contemporary artworks. Our multi-analytical approach, a significant aspect of our research, is a means to this end. The conservation of works of art is our [...] Read more.
This microreview, conducted by interdisciplinary teams, examines complex heritage material systems, such as medieval colors and modern and contemporary artworks. Our multi-analytical approach, a significant aspect of our research, is a means to this end. The conservation of works of art is our shared goal, as it ensures their accessibility and the transfer of cultural heritage to future generations. We seek to interpret the damage, usefulness, and innovation of the experimental design in this context. As Jan Wouters rightly points out, “The terminology used nowadays to describe the potential damage to objects caused by analysis should be refined beyond the destructiveness/non-invasiveness polarization. A terminology should include at least degree level intervention (low, medium, high), usefulness, and innovation”. Complementing micro- or sub-micro-sampling with the appropriate analytical methods is crucial, as exemplified in medieval, modern, and contemporary collections studies. Finally, a novel perspective for exploring the information contained in the multiscale heterogeneity of organic historical materials is envisaged, and it includes UV/Visible photoluminescence spectral imaging using a low-intensity ultraviolet synchrotron beam. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>Timeline of the manuscripts studied by our team.</p>
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<p>The medieval paint formulation comprises the dye or pigment, the binder, and additives (<b>top</b>). The average time for analysis of this initial in situ was 195 min, more than 3 h. The micro-samples would have taken 90 min.</p>
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<p>The feedback system for studying color in medieval illuminated manuscripts. The historically accurate reconstructions are made according to medieval written sources and are highly characterized by an analytical approach. The information obtained is used to understand better the historical colors and objects at the molecular level.</p>
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<p>The range of synthetic polymers (thermoset, thermoplastics, and elastomer) identified in radio casings from 1934 to 2003 by FTIR-ATR [adapted from [<a href="#B49-heritage-07-00259" class="html-bibr">49</a>]]. Most radios courtesy of Die Neue Sammlung—The Design Museum, Munich.</p>
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<p>Normalized pyrograms of the net pigment powder PR 53:1 before (0 h) and after artificial light aging (770 h) and corresponding stereomicroscope images. Besides the main pyrolysis products (Mw 141, tR 9.6 min; Mw 144, tR 11.4 min; Mw 266, tR 18.7 min), decay products such as phthalic anhydride (Mw 148, tR 9.6 min) and phthalimide (Mw 147, tR 10.9 min) were detected [<a href="#B58-heritage-07-00259" class="html-bibr">58</a>].</p>
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<p>Molecular weight data of 3D-CN show that degradation gradients in depth profile are formed due to aging. The orientation of the gradient in moderate condition (more degraded surface than core) seems to inverse when 3D-CN reaches a severe condition (higher polymer chain scission in the core than at the surface) [adapted from [<a href="#B72-heritage-07-00259" class="html-bibr">72</a>,<a href="#B73-heritage-07-00259" class="html-bibr">73</a>].</p>
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14 pages, 3652 KiB  
Review
New Frontiers in the Digital Restoration of Hidden Texts in Manuscripts: A Review of the Technical Approaches
by Michela Perino, Lucilla Pronti, Candida Moffa, Michela Rosellini and Anna Candida Felici
Heritage 2024, 7(2), 683-696; https://doi.org/10.3390/heritage7020034 - 3 Feb 2024
Cited by 2 | Viewed by 2283
Abstract
The digital restoration of historical manuscripts centers on deciphering hidden writings, made imperceptible to the naked eye due to factors such as erasure, fading, carbonization, and aging effects. Recent advancements in modern technologies have significantly improved our ability to unveil and interpret such [...] Read more.
The digital restoration of historical manuscripts centers on deciphering hidden writings, made imperceptible to the naked eye due to factors such as erasure, fading, carbonization, and aging effects. Recent advancements in modern technologies have significantly improved our ability to unveil and interpret such written cultural heritage that, for centuries, had remained inaccessible to contemporary understanding. This paper aims to present a critical overview of state-of-the-art technologies, engaging in discussions about perspectives and limitations, and anticipating future applications. Serving as a practical guide, this work seeks to assist in the selection of techniques for digitally restoring ancient writings. Additionally, potential and challenges associated with integrating these techniques with advanced machine-learning approaches are also outlined. Full article
(This article belongs to the Special Issue Non-invasive Technologies Applied in Cultural Heritage)
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<p>(<b>a</b>) Photography of Parch. 38 belonging to the collection of the Library of the Department of History, Anthropology, Religions, Art History, Media and Performing Arts of Sapienza University of Rome; MSI with a UV source and filters at (<b>b</b>) 470 nm; (<b>c</b>) 500 nm; (<b>d</b>) 532 nm; (<b>e</b>) 600 nm; (<b>f</b>) 680 nm; (<b>g</b>) 700 nm; and (<b>h</b>) 750 nm. Reproduced under the terms of Creative Commons Attribution License 4.0 from [<a href="#B6-heritage-07-00034" class="html-bibr">6</a>].</p>
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<p>Examples of the prediction of a semantic segmentation model applied on a synthetic dataset of overlapping handwritten letters. In the top panels is the segmentation of complex combinations of A + C and D + E; in the bottom panels is the segmentation of complex combinations of B + C and A + D. To enhance visualization and explore potential patterns in noise residuals, the authors employ a min–max scaling technique for the color palette representation of predicted segmentation masks. Consequently, white pixels in each panel indicate zero flux, while black pixels represent the maximum flux in the mask. To facilitate a fair comparison between different masks and identify significant signals amidst noise residuals, histograms illustrate the distribution of maximum fluxes in each panel. Reproduced under the terms of Creative Commons Attribution License 4.0 from [<a href="#B32-heritage-07-00034" class="html-bibr">32</a>].</p>
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<p>Distribution maps of calcium, iron, mercury L-lines and lead L-lines of parchment recycled into bookbinding. Reproduced under the terms of the Creative Commons Attribution 4.0 International License from [<a href="#B43-heritage-07-00034" class="html-bibr">43</a>].</p>
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<p>Complete virtual unwrapping of the En-Gedi scroll. Reproduced under the terms of Creative Commons Attribution Non-Commercial License 4.0 from [<a href="#B46-heritage-07-00034" class="html-bibr">46</a>].</p>
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<p>(<b>a</b>) Photograph of the paper guard of a seventeenth-century book; (<b>b</b>) a contrasted thermogram recorded just after the light pulse revealed a first written fragment concealed beneath the paper guard; (<b>c</b>) a contrasted thermogram recorded 300 ms after the light pulse revealed a second written fragment that belongs to a deeper subsurface, glued just beneath the previous one. Reproduced with permission from [<a href="#B3-heritage-07-00034" class="html-bibr">3</a>]; published by Taylor &amp; Francis Ltd., 2020.</p>
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<p>(<b>a</b>) THz images from 25 layers of letters written with black gel pen on paper present excellent consistency and high contrast. The proposed methodology named pulse neighborhood average imaging (PNAI) can eliminate letter superpositions, and the quality of the resulting THz images is comparable with that of optical images of the letter on single sheets of paper. Images are normalized separately with the mean value set to 0.4. (<b>b</b>) The estimated signal-to-noise ratio (SNR) of THz signals for each layer and (<b>c</b>) the evaluation of THz image quality using the peak SNR obtained by various imaging algorithms highlighting that the PNAI method provides a substantial improvement in image contrast. Reproduced under the terms of Creative Commons Attribution Non-Commercial License 4.0 from [<a href="#B78-heritage-07-00034" class="html-bibr">78</a>].</p>
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<p>Photoacoustic imaging of a layered document with non-overlapping text; (<b>a</b>) representation of the sample; (<b>b</b>) photoacoustic images through top (XY) and side views (XZ; YZ). Reproduced with permission from [<a href="#B85-heritage-07-00034" class="html-bibr">85</a>];published by John Wiley &amp; Sons Ltd., 2019.</p>
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<p>Photoacoustic imaging of a layered document with overlapping text; (<b>a</b>) representation of the sample; (<b>b</b>) top view of a photoacoustic image; (<b>c</b>–<b>g</b>) individual reconstructions of five sequential pages. Reproduced with permission from [<a href="#B85-heritage-07-00034" class="html-bibr">85</a>]; published by John Wiley &amp; Sons Ltd., 2019.</p>
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