Multi-part photographic color developing composition and methods of manufacture and use
US6436618B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 2001 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | May 21, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/266
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multi-part color developing kit includes at least two parts (or solutions) of photochemical compositions that can be mixed to provide a color developing composition useful for obtaining color photographic images. A first aqueous solution is formulated with a color developing agent in free base form, an antioxidant for the color developing agent, an inorganic base, a triazinylstilbene optical brightening agent, an chemical base and a water-miscible or water-soluble hydroxy-substituted, straight-chain organic solvent. A second aqueous solution is formulated with a buffering agent, the same or different chemical base and a phosphonic acid metal ion sequestering agent. Both solutions have a pH and homogeneity to provide a clear color developing composition that is safer for use and disposal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.