Process for the preparation of extracted with three or four colors

摘要

448,161. Colour photography. GASPAR, B., 42, Avenue Victor Rousseau, Forest, Brussels. Aug. 9, 1935, No. 22533. Convention date, Aug. 9, 1934. [Class 98 (ii)] A bipack comprises one film having two superimposed light-sensitive layers of different coloursensitivity containing colour - forming components which produce different colours in the two layers and another film having either one light-sensitive layer or having two superimposed layers, the colour-sensitivity of which is different from that of the first film. The same colour-forming components may be used for both films. One film may carry a blue-sensitive silver bromide layer containing thioindoxylcarboxylic acid and a green-sensitive silver bromide layer sensitized with naphthothiopseudocyanine and containing alphachloroacetoacetic ester and a filter dyestuff such as filter yellow or 1-paradimethylaminostyrylbenzoxazole ethyl iodide. A red destructible filter layer containing furfuraniline may be provided. The rear film carries a red-sensitive or panchromatic layer which is either colourless or contains Fast Red D or is provided with a filter layer containing a destructible red dyestuff. The rear film may, in a modification, have both a red-sensitive and a panchromatic layer which contain the same dyestuff-forming components as the front layers. In a further modification, the front film carries a blue-sensitive layer without dyestuff-forming components and the rear film carries green-sensitive and redsensitive layers. Benzoylacetic ester may replace the alphachloroacetoacetic ester, and cyanacetophenone, coumaranone, or paranitrobenzylcyanide the thioindoxylcarboxylic acid. The layers containing the dyestuff-forming components are developed with monoethylparaphenylenediaminehydrochloride. After fixing, the silver is dissolved with Farmer's reducer. The colour-component records are either copied on to three separate layers with the use of suitable colour filters, or the twolayer film is copied directly on to multi-layer material. Specifications 379,679 and 415,040 are referred to.