Photographic bleaching and bleach-fixing solutions

Details Photographic bleaching and bleach-fixing solutions Photographic bleaching and bleach-fixing solutions

1988-03-01

1990-06-12

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Color imaging process

Using identified radiation sensitive composition in the...

430430, 430460, 430461, G03C 742

Patent

active

049332660

ABSTRACT:
Bleaching and bleach-fixing solutions, especially useful in the processing of a photographic color material, contain a bleaching agent comprising a ferric complex of propylenediaminetetraacetic acid and a hydroxy-substituted chelating agent present in an amount sufficient to reduce the formation of ferric propylenediaminetetraacetic acid precipitates. The solutions do not generate unacceptable stain or adversely affect leuco cyan dye recovery or process cleanliness.

REFERENCES:
patent: 4294914 (1979-03-01), Fyson
patent: 4552834 (1985-11-01), Lau et al.
patent: 4563405 (1986-07-01), Ishikawa
patent: 4601975 (1986-07-01), Koboshi et al.
patent: 4717647 (1988-01-01), Abe et al.
Research Disclosure, vol. 240, Item 24023, Apr. 1984, p. 156.

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