DE586845C - Process for making color photographs - Google Patents

Description

It was previously not possible to make natural colored paper images on the basis of in contact or by enlarging copies made on developing paper. It could probably use the blue and yellow partial image in the three-color process Shades of color can be toned, but there has been no process to date to make a gas light copy in to transform that red shade that the

to require three-color ^{printing, since v} neither the copper nor the uranium toning meets the requirements for a correct color synthesis. The invention overcomes this shortcoming so that it is possible to produce all three partial images by toning ordinary silver images, e.g. B. the right side on ordinary bromide silver or gas light paper, the other two on peelable developing papers or films and then all

ao to transfer three layers on top of each other in exact congruence.

It has been shown that the precipitate of nickel dimethyl formed in gelatin glyoxim or its homologues give a red hue, which is suitable with the through Blue and yellow tones achieved all basic and mixed colors and gray values reproduce in an excellent manner.

The use of a nickel dimethylglyoxime image in color photography is known per se. It is also known to use the gelatin contained therein To give silver image an image-wise distributed different hardening and thereby to wash off nickel salts incorporated in the gelatine to varying degrees or to remove with the unhardened gelatin itself.

The essence of the invention consists of the known in the use of a The silver image produced via halogen silver, which is thereby converted into a red image is that the silver of the image is substituted by a nickel compound and this in Nickel dimethylglyoxime or its homologue * S is converted.

The further embodiment of the invention is that for the production of naturally colored Images by the formation of nickel dimethylglyoxime or its homologues red toned silver image with one yellow toned and one blue toned silver image is combined.

For example, the procedure is carried out as follows:

After the three partial color negatives reversed copies produced on halide silver emulsion layers. The halogen silver emulsion layers are on glassine paper or some other highly transparent

Type of paper cast in a known manner, removable. From the developed and fixed The images of the blue filter take up in a known way about the formation of lead ferrocyan, by bathing in ferricyanide and lead nitrate solution and subsequent formation tinted yellow by lead chromate. The red filter negative copy is made in a mixture of Potassium ferricyanide and a ferric salt toned blue in a known manner.

The silver image produced after the green filter uptake is transformed into a red image of Corresponding, with the yellow and blue partial picture perfectly matching in the color triad This changes the color tone. converted that the silver of the picture by Niekeldimethylglyoxim or its homologues is substituted.

This substitution succeeds z. B. on the following Way: The silver image is transformed into a lead image in the same way as described for the yellow image and this is then converted by bathing in a nickel salt (nickel sulfate) Nickel ferrocyan image replaced. This nickel salt image is then treated with Dimethylglyoxime or its homologues converted into the desired red image.

The toning process can be beneficial by using a non-dimethylglyoxime reactive complex nickel salt, e.g. B. Kaliumnickelcyanür carried out and you can achieve pure whites in a simple and safe way.

A mixture of potassium nickel cyanur + dimethyldioxime + ammonia alone introduces The silver picture slowly turns into a red picture. It can also be done in such a way that one Image to be toned is first soaked in the dimethyldioxime solution, one of which is sufficient Crowd is held. Since nickel salts are difficult to wash out of gelatine layers, the dimethyldioxime bath can also be used after the potassium nickel cyanuric bath, but with less sure success.

The reaction of a mixture of potassium nickel cyanide and dirnethylglyoxime with halogen or cyan silver takes place more quickly. The toning process can advantageously be carried out in a single bath by the action of a mixture of potassium ferricyanide, possibly with the addition of potassium bromide, potassium nickel cyanide, dimethylglyoxime and ammonia.
Instead of potassium ferricyanide, it is also possible to use substances that convert the silver into halogenated silver.

Images treated with the well-known Eder-Toth lead amplifier can be used with 60. the mixture of potassium nickel cyanur and dimethyldioxime on the basis of the cyan silver image tinting red and yellow due to the lead image, so that an image emerges that is in his Tone 'corresponds to that of the two-color process. ■ "

The invention is not limited to the use of potassium nickel cyanur, but also applies to the use of other nickel-containing compounds with Dimethyldioxime does not react per se.

The toned images are dried. Barite-coated paper is now mixed with a solution an easily meltable resin, if necessary with the addition of softening agents. After the coating has dried, the yellow image is placed with the layer side on and hot ironed or calendered. The glassine paper is now peeled off, and the yellow image adheres firmly to the new surface. In the same way, the red 8a and finally transferred the blue image. The achievement of the cover is here through the Use of the glassine paper as a carrier layer is greatly facilitated.

The use of glassine paper also has the advantage that the colors are correct can be assessed in review before transferring. Corrections can be made by weakening one or two of the partial images be made.

The known attenuating means are used for the blue and yellow partial image.

The red part of the picture is created by bathing in weak, advantageously organic acids with the exception of acetic acid attenuated.

Claims (7)

Patent claims: 1. Process for the production of color photographs, characterized in that that the silver of a silver image produced via halogen silver is substituted by a nickel compound and this is converted into Niekeldimethylglyoxim. 2. The method according to claim 1, characterized in that the silver image below Use of a nickel salt that reacts with dimethylglyoxime in a nickel no dimethylglyoximbild is converted. 3. The method according to claim 1, characterized in that the silver image below Use of a nickel salt that does not react with dimethylglyoxime converted into a nickel dimethylglyoxime image will. 4. The method according to claim 3, characterized in that a bath is applied ^ which is an agent for converting the silver into halogen or cyan silver, a non-reactive with dimethylglyoxime complex nickel salt, ζ. B. Kaliumnickelcyanür, and Dimethylglyoxim contains. ■ 5. Process according to claims 1 to 4, characterized by the use the homologue of dimethylglyoxime. 6. The method according to claims 1 to 5, in particular for the production of natural-colored photographs, characterized in that a by the formation of Nickel dimethylglyoxime or its homologues red tinted silver Aüld with a yellow toned and a blue toned silver picture is combined. 7. The method according to claim 1, characterized in that the silver image means of the Eder-Toth lead amplifier bleached and red due to the cyan silver image and red due to the lead image is toned yellow, so that a yellow-red image corresponding to the two-color process is created.