Photographic bleaching solution and use thereof in photographic

Details Photographic bleaching solution and use thereof in photographic Photographic bleaching solution and use thereof in photographic

1991-04-19

1991-10-29

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Bleach or intensification

430393, 430430, 2521861, G03C 544

Patent

active

050616080

ABSTRACT:
An environmentally advantageous photographic bleaching solution for use in the color processing of photographic elements comprises (1) as a bleaching agent, a potassium salt of a ferric complex of an aminopolycarobxylic acid, (2) as an agent which functions to convert silver to silver halide, a potassium halide, and (3) as an agent which functions to inhibit bleach induced dye formation, a water-soluble aliphatic carboxylic acid. The bleaching solution is especially useful in the processing of photographic elements containing a low pKa, high-activity, yellow-dye-forming coupler in that it serves to effectively avoid the undesirable increase in blue D.sub.min that can occur in such elements as a result of bleach induced dye formation.

REFERENCES:
patent: 4242442 (1980-12-01), Idota et al.
patent: 4268618 (1981-08-01), Hashimura
patent: 4444873 (1984-01-01), Ishikawa et al.
patent: 4780398 (1988-10-01), Kim
patent: 4822725 (1989-04-01), Abe et al.

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