Bleach/fix solution for single-use silver removal in color negative films
US6489089B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 2000 |
| Grant date | Dec 3, 2002 |
| Priority date | — |
| Expiry date | Nov 3, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/42
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of bleaching and fixing a developed silver halide color negative element comprising mixing a bleaching solution containing an oxidizing agent with a fixing solution containing a silver ion solubilizing agent to form a bleach-fixing solution; shortly after or simultaneously with said mixing, bleach/fixing the silver halide element by contacting it with the bleach/fixing solution; and discarding the bleach/fixing solution after one use; wherein the bleach/fixing step is performed at an elevated temperature; and wherein the silver halide color negative element comprises a silver bromoiodide emulsion with an average iodide content of more than 1 mol % iodide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.