Process for the production of a photographic image
US4439518A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1982 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | Jun 18, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/30523
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for the production of a photographic black dye image which comprises PA0 (a) imagewise exposing photographic silver halide material comprising at least one silver halide emulsion layer coated on a support, there being present in the silver halide emulsion layer(s) or in a layer in operative contact with at least one silver halide emulsion layer a resorcinol compound of the formula ##STR1## where each of W, Y and Z is hydrogen, chlorine or bromine, a nitrogen-linked heterocycle, --SR.sub.1 where R.sub.1 is alkyl, aryl or a heterocycle or W, Y or Z is acylamino or --R.sub.3 where --R.sub.3 is alkyl, cycloalkyl or aralkyl or Z alone is --CO--R.sub.1 where R.sub.1 is as just defined but at least one of W, Y and Z must be --R.sub.3, and X which is the coupling position is hydrogen, chlorine or bromine, a nitrogen-linked heterocycle or --SR.sub.1, PA0 (b) color developing the exposed material using a color developing solution which comprises an aqueous alkaline solution of a primary aromatic amine color developing agent to form simultaneously a silver image and a black dye image, PA0 (c) optionally bleaching the silver image, and then PA0 (d) fixing out all the silver halide in t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.