Use of ketal blocked quinones to reduce post-process d-min...

Details Use of ketal blocked quinones to reduce post-process d-min... Use of ketal blocked quinones to reduce post-process d-min...

G - Physics

03

C

96/274, 96/34, 9

G03C 1/40 (2006.01) G03C 8/00 (2006.01) G03C 8/36 (2006.01) G03C 8/52 (2006.01)

Patent

CA 1178470

Abstract of the Disclosure Photographic assemblages and processes are described employing positive-working redox dye- releasers and a processing composition containing a ketal blocked quinone which is soluble therein. After processing, when the pH is lowered, the free quinone is released for reaction with residual elec- tron transfer agent present in the assemblage to pre- vent it from reacting with the dye releaser, which would otherwise cause further dye release. Dmin stability is thereby improved.

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