Method of processing photographic silver dye bleach materials
US4138256A · kind A · utility
5Cited by
9References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 11, 1976 |
| Grant date | Feb 6, 1979 |
| Priority date | — |
| Expiry date | Nov 11, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/54
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of processing photographic silver dye bleach materials which have been exposed imagewise is provided. The process steps are (1) silver developing, (2) dye bleaching, (3) silver bleaching and (4) fixing. The treatment baths for the process steps (2), (3) and (4), or the combined treatment baths useful for process step (3) with at least one the process steps (2) or (4) contain water-soluble tertiary phosphines as silver ligands. These phosphines effect an acceleration of the dye and silver bleaching and they are further suitable stabilizers and optionally antioxidants which yield stable treatment baths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.