Photographic fixer composition and method
US5629138A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1995 |
| Grant date | May 13, 1997 |
| Priority date | — |
| Expiry date | Dec 29, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/38
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a fixer composition and a method of processing an exposed photographic silver halide element comprising the steps of developing by means of a developer comprising a silver halide developing agent and treating the developed element with a fixer composition, wherein the fixer composition comprises a silver halide solvent, a sulfite ion source, an aluminum salt hardening agent, a buffering agent, a sequestering agent and an .alpha.-ketocarboxylic acid compound in an amount of more than 2 grams per liter corresponding to the formula: EQU R--CO--COOH wherein R represents a hydrogen atom or an organic group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.