Triazolium thiolate baths for silver halide development acceleration
US5776666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1993 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Mar 3, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/52
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of accelerating black and white development comprising contacting a negative-type silver halide photographic element during processing with a developer prebath or a developer bath comprising an accelerator compound of the formula: ##STR1## is disclosed, wherein R.sub.1, R.sub.2, and R.sub.3 are substituents; said R.sub.1, R.sub.2, and R.sub.3 may further combine with each other to form a 5-, 6-, or 7-membered ring; and wherein said developer prebath and developer bath do not contain any iron(III) ion complex salt having bleaching activity. A bath selected from the group consisting of developer prebaths and developer baths for black and white development of a negative-type silver halide photographic element comprising an aqueous solution of accelerator compound of the formula: ##STR2## is also disclosed, wherein R.sub.1, R.sub.2, and R.sub.3 are substituents; said R.sub.1, R.sub.2, and R.sub.3 may further combine with each other to form a 5-, 6-, or 7-membered ring; with the proviso that said developer prebath and developer bath do not contain any iron(III) ion complex salt having bleaching activity or any nucleating agent capable of chemically fogging a negative-type silve…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.