Process comprising bleaching, bleach-fix and fixing silver halide color photographic material
US5147765A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1990 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Oct 31, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/164
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for processing silver halide color photographic materials is disclosed, comprising: PA0 (1) color-developing an imagewise exposing silver halide color photographic material with a primary aromatic amine based color developing agent, and then PA0 (2) desilvering said photographic material by a process comprising the following steps conducted in sequence: PA1 (a) treating in a bleaching bath, PA1 (b) treating in a bleach-fixing bath, and PA1 (c) treating in a fixing bath, PA0 wherein said bleaching bath is a bath of a bleaching solution having a pH of not more than 5.0 which contains an aminopolycarboxylic acid ferric complex salt having a redox potential of at least 150 mV, said fixing bath is a bath of a fixing solution having a pH of at least 6.5 which contains an aminopolycarboxylic acid whose corresponding ferric complex salt has a redox potential of less than 150 mV, or a salt of said acid, and said bleach-fixing bath comprises at least a bleaching solution which has been introduced from said bleaching bath and a fixing solution which has been introduced from said fixing bath.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.