Use of ketal blocked quinones to reduce post-process D-min incre

Details Use of ketal blocked quinones to reduce post-process D-min incre Use of ketal blocked quinones to reduce post-process D-min incre

1983-05-02

1984-03-06

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Developer

568591, 568592, G03C 140, G03C 530

Patent

active

044355025

ABSTRACT:
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 electron transfer agent present in the assemblage to prevent it from reacting with the dye releaser, which would otherwise cause further dye release. D.sub.min stability is thereby improved.

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patent: 4203811 (1980-05-01), Cramer

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