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Color Photography Patents — Kelley 155
including substances which dissolve the silver . salts and also containing substances which produce insoluble lakes with the dyes used for coloring the prints. Auguste Jean Baptiste Tauleigne and Eline Mazo, U. S. No.
1,059,917. Filed Mar. 23, 1910
Claim 1 : The herein described steps in a process for the production of colored photographs from ordinary silver positives, which consists in the treatment of the positive with bichloride of copper, subsequently treating it with iodide of potassium, immersing it in an aniline dye bath, washing with water, fixing the color by immersion in a solution of tannin. Washing to eliminate excess of tannin, fixing the print, and finally washing to eliminate the fixing reagent.
Wm. Francis Fox, U. S. No. 1,166,123. Dec. 28, 1915 Vanadium ferrocyanide forms the mordant for basic dyes, (See
Class 2).
Hoyt Miller, U. S. No. 1,214,940. Feb. 6, 1917. Filed Feb. 26,
1915
Claim 10: The herein described method, comprising bleaching a photographic image by treatment with iodine and iodide, treating the bleached image with sodium bisulphite to clear the same of iodine, washing out the bisulphite, treating the image with a dye of the desired color, and then washing out the excess dye. P. D. Brewster, U. S. No. 1,537,524. May 12, 1925. Filed
Dec. 6, 1918
Improvement on Hoyt Miller, above.
Jesse M. Blaney, U. S. No. 1,331,092. Feb. 17, 1920. Filed
May 22, 1918
Claim 3: The method of producing photographic images which consists in substituting for the silver forming the initial photographic image a salt of tin, removing the silver forming the initial image and treating the tin image forming material with a dye of the desired color to produce a colored image. Leon F. Douglass, U. S. No. 1,450, 412. Apr. 3, 1923. Filed
Oct. 16, 1919
Claim: The process of making a colored photographic image from a black silver image, which consists in replacing the black silver image with an iron blue toned image, treating said converted image with a basic dye, and subsequently causing said image