Photographic bleaching composition and processing method using t

Details Photographic bleaching composition and processing method using t Photographic bleaching composition and processing method using t

1995-01-10

1996-12-10

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Color imaging process

Using identified radiation sensitive composition in the...

430461, 430428, 430430, 430460, G03C 700, G03C 538, G03C 542, G03C 544

Patent

active

055829589

ABSTRACT:
A photographic bleaching or bleach/fixing composition contains a water-soluble ternary complex of an iron ion, a polycarboxylate ligand, and a second ligand which has at least one carboxyl group on an aromatic nitrogen heterocycle, such as a pyridinecarboxylic acid. Preferred materials are biodegradable, but all of the ternary complexes can be used in a variety of bleach or bleach/fix processes to good advantage as bleaching agents. They are particularly suitable for use in rehalogenating ferric chelate bleaches.

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patent: 5460924 (1995-10-01), Buchanan et al.

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