Photographic conditioning solution concentrate containing bleach accelerator and formaldehyde precursor and method of use
US5552264A · kind A · utility
12Cited by
6References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1995 |
| Grant date | Sep 3, 1996 |
| Priority date | — |
| Expiry date | Apr 5, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3046
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A conditioning or bleach accelerating solution can be used to process color photographic films, especially color reversal films, to minimize magenta dye fade while reducing the needed amount of formaldehyde stabilizer. This solution is provided in highly concentrated form and diluted up to 9:1 prior to or during use. The concentrate contains a formaldehyde precursor at 200 to 450 g/l, a sulfite at from 40 to 100 g/l, a bleach accelerating agent at 1.5 to 13.5, and a metal ion chelating agent at 5 to 45 g/l.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.