GB384770A - Improvements relating to photographic bichromate colloid processes - Google Patents
Improvements relating to photographic bichromate colloid processesInfo
- Publication number
- GB384770A GB384770A GB31906/31A GB3190631A GB384770A GB 384770 A GB384770 A GB 384770A GB 31906/31 A GB31906/31 A GB 31906/31A GB 3190631 A GB3190631 A GB 3190631A GB 384770 A GB384770 A GB 384770A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bichromate
- contrasts
- photographic
- processes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/66—Compositions containing chromates as photosensitive substances
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
384,770. Bichromate processes. LESSEPS, F. DE, 65, Rue de Courcelles, Paris. Nov. 17, 1931, No. 31906. Convention date, Feb. 6. [Class 98 (ii).] To vary the contrasts in a print sodium bichromate and potassium bichromate are used in variable proportions, the former tending to produce soft, and the latter hard, contrasts. Particulars of different proportions are given. The print is developed first in cold water, then in warm water (to which ammonium or potassium carbonate may be added) to dissolve away unexposed colloid. The prints are coloured by successive immersion in solutions which react to form a coloured compound, for example first in iron perchloride and then in pyrogallic acid, tannic acid, or gallic acid.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR727354T | 1931-02-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB384770A true GB384770A (en) | 1932-12-15 |
Family
ID=9111215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31906/31A Expired GB384770A (en) | 1931-02-06 | 1931-11-17 | Improvements relating to photographic bichromate colloid processes |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR727354A (en) |
| GB (1) | GB384770A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2577984A (en) * | 1945-11-08 | 1951-12-11 | Warnecke Harry Walter | Method of making color printing plates |
-
1931
- 1931-02-06 FR FR727354D patent/FR727354A/en not_active Expired
- 1931-11-17 GB GB31906/31A patent/GB384770A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2577984A (en) * | 1945-11-08 | 1951-12-11 | Warnecke Harry Walter | Method of making color printing plates |
Also Published As
| Publication number | Publication date |
|---|---|
| FR727354A (en) | 1932-06-17 |
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