Cyan dye recovery using ferric aminopolycarboxylic acid bleaching composition
US6096487A · kind A · utility
4Cited by
6References
15Claims
0Family size
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Inventor
Key dates
| Filing date | Mar 2, 1999 |
| Grant date | Aug 1, 2000 |
| Priority date | — |
| Expiry date | Mar 2, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2001/03517
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Cyan dye density can be maximized in color developed silver halide photographic color materials and bleaching accelerated by contacting the materials with a bleaching or bleach-fixing composition comprising a mixture of a ferric complex of an aminopolycarboxylic acid as a bleaching agent, and an aromatic pyridinyl mono- or dicarboxylic acid in uncomplexed form. The molar ratio of the uncomplexed aromatic carboxylic acid to the ferric ion in the bleaching composition is from about 0.02:1 to about 0.8:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.