Method for processing silver dye-bleach materials
US4186008A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1978 |
| Grant date | Jan 29, 1980 |
| Priority date | — |
| Expiry date | Mar 15, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for processing silver dye-bleach materials, with the process measures silver developing, dye bleaching, silver bleaching and fixing, wherein the silver and dye bleaching can be combined in a single treatment step is provided. For the silver bleaching or the combined dye and silver bleaching an acid formulation is used which has a pH value of at most 2 and contains a strong acid, a water-soluble iodide, optionally a water-soluble organic nitro compound, a non-quaternised quinoxaline or pyrazine, an anti-oxidant and at least one quaternary ammonium salt or a protonated tertiary organic nitrogen base. By this method the processing time can be shortened without impairing the quality of the colored images obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.