Photographic bleaching and bleach-fixing solutions
US4933266A · kind A · utility
18Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1988 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Mar 1, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/42
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.