DE451506C - Process for the production of dye images by converting the silver into color-absorbing silver compounds - Google Patents

Description

Process for the preparation of dye images by converting the Silver in color-drawing silver compounds. A large number of procedures are available known, after which stained silver pictures stained with organic dyes or converted to a dye image, e.g. B. the method according to the German patents 187: 289, 188 164, 393 790, 403 428 and after your French Patent 420,584. In all of these processes, a silver image is first made into one transferred from iodized silver or from a metal-silver double salt. These silver compounds are known to have the property of being colored by organic basic dyes to become. One is in the choice of the dyes suitable for these processes limited to the extent that only those can be taken that are well-stained Color the silver picture, but not the binding agent (gelatine). -According to the present Invention can also initially use the silver image in iodized silver or silver-copper-ferrocyanide transformed and then the image layer can be colored with dye. One can also follow the reverse order, namely first color the image layer and only then transfer the silver image into the color-drawing silver compound. In any case but there is no limit to the choice of dyes, because the entire - Image layer (silver salt image + gelatin) is made by bathing in the dye solution colored. If you treat these from colored gelatin and colored silver salt picture existing layer with sodium hydrosulphite solution, it becomes complete again discolored. It has now surprisingly been found that the hydrosulfite solution through the addition of organic, water-soluble compounds, e.g. B. acetone, alcohol, Dioxane, which retains the property of a selectively acting caustic agent. By only the colored gelatin bleaches, the dye on the pickled and colored silver image does not attack, however, it develops the previously uniformly colored image layer to a silver dye image.

The process is suitable for coloring slides, films and paper pictures and of partial images for three-color printing.

The following examples are given for explanation: Example i.

The silver of a slide becomes iodized silver in a known manner transferred and the whole slide in a weak solution of a basic dye, z. B. in a 1/4 to 1/2 percent solution of methylene blue, brilliant green or the like, completely colored. The plate is dried and then in a mixture of i Part 1 percent hydrosulfite solution and 2 parts of acetone bathed. The color will completely at the unpickled areas etched away while they are on the iodized silver stops. At the end there is a short watering.

Example 2.

The not too strongly opaque slide is first placed in the dye solution colored, then in a copper clay bath, e.g. B. copper reinforcement, pickled and as in Example i treated further.

Claims (1)

PATENT CLAIM: Process for the production of color images from Silver images by converting the silver into color-drawing silver compounds, characterized in that the colored with organic dyes throughout Image layer treated with an etching agent for the purpose of bleaching the silver-free atelles will.