Photographic peracid bleaches with ferric 2-pyridinecarboxylate and 2,6-pyridinecarboxylate catalysts
US5536625A · kind A · utility
32Cited by
10References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1995 |
| Grant date | Jul 16, 1996 |
| Priority date | — |
| Expiry date | Mar 20, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/144
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention provides an accelerator for peracid bleaches used for bleaching silver halide photographic elements. The accelerator is a complex of ferric (Fe III) ion and a 2-pyridinecarboxylic acid or a 2,6-pyridinecarboxylic acid. The accelerator may be contained in the bleaching solution, a solution preceding the bleaching solution or in the photographic elements themselves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.