Photographic element for color diffusion transfer with two neutralizing layers
US4551410A · kind A · utility
3Cited by
3References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1984 |
| Grant date | Nov 5, 1985 |
| Priority date | — |
| Expiry date | Jul 16, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a color diffusion transfer photographic element, a novel neutralization system for reducing the pH of an alkaline processing solution comprises at least two steps wherein the first step pH of the processing solution is reduced to a range in which development and dye release reactions are substantially discontinued but in which diffusion of dyes for forming transfer images continues, and in the second step pH is further reduced and allows to reduce at a neutralization rate lower than the rate in the first step to a final pH of which the transfer image formed is stable upon storage for a long period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.