Stabilized peroxide bleaching solutions containing multiple chel

Radiation imagery chemistry: process – composition – or product th – Color imaging process – Using identified radiation sensitive composition in the...

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430430, 430461, 430943, G03C 700, G03C 544, G03C 542

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active

055410413

ABSTRACT:
Color photographic elements are bleached after exposure and development by using a peroxide bleaching solution. This solution comprises a peroxide bleaching agent, chloride ions in an amount of at least 0.35 mol/l, a first acid which is an organic phosphonic acid and a second acid which is a polyaminocarboxylic acid having one or more secondary amines at a pH of 8 to 11. The bleaching solution is stabilized by the presence of the two acids.

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patent: 5250401 (1993-10-01), Okada et al.
patent: 5316898 (1994-05-01), Ueda et al.

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