Photographic processing composition and method using cationic hy

Details Photographic processing composition and method using cationic hy Photographic processing composition and method using cationic hy

1994-12-22

1996-04-23

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Bleaching

430357, 430372, 430393, 430427, 430429, 430461, G03C 742

Patent

active

055102328

ABSTRACT:
Certain cationic hydroquinones are useful catalysts for persulfate bleaching agents in photographic processing methods. These compounds are oxidizable by persulfate and reducible by silver metal at a pH of from 1 to 7, and have a chemically reversible redox couple of from about -0.20 to about +1.5 volts. The persulate bleaching ability is enhanced by the presence of these compounds which are used in a step prior to bleaching.

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