Processing silver dye-bleach materials in a composition...

Details Processing silver dye-bleach materials in a composition... Processing silver dye-bleach materials in a composition...

G - Physics

03

C

96/273, 96/71

G03C 7/00 (2006.01) G03C 7/28 (2006.01)

Patent

CA 1130128

Abstract of the Disclosure A method for processing silver dye-bleach materials, with the process measures silver developing, dye bleaching, silver bleaching and fixing, wherein the silver and dye bleaching can be combined in a single treatment step is provided. For the silver bleaching or the combined dye and silver bleaching an acid formulation is used which has a pH value of at most 2 and contains a strong acid, a water-soluble iodide, optionally a water-soluble organic nitro compound, a non-quaternised quinoxaline or pyrazine, an anti-oxidant and at least one quarternary ammonium salt or a protonated tertiary organic nitrogen base. By this method the processing time can be shortened without impairing the quality of the coloured images obtained.

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