# US 4,391,884 A · Process for the production of a photographic color image by the silver dye bleach process and suitable color photographic material therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,391,884 A - Document ID: US4391884A - Status: Granted - Kind: A - Application number: 06/255,069 - Filed: 1981-04-17 - Granted: 1983-07-05 - Earliest claimed: 1980-04-30 - Assignees: Ciba-Geigy Corporation - Inventors: Armin Meyer; Carlo Boragine - Web page: https://patentgrep.com/patent/US4391884A ## CPC - G03C 7/28: Silver dye bleach processes; Materials therefor; Preparing or processing such materials - G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G) ## Abstract A process for the production of a photographic color image by the silver dye bleach process, using a photographic material which comprises, on a base, at least one light-sensitive silver halide emulsion layer, which can contain a diffusion-resistant bleachable image dye, and immediately above this layer, on the side facing the light source, a silver halide-free layer containing a diffusion-resistant, bleachable image dye. The process gives very sharp photographic color images. ## Claims ### Claim 1 A process for the production of a photographic colour image by the silver dye bleach process, by exposure, silver developing, dye bleaching, silver bleaching and fixing, and using a photographic material which contains light-sensitive silver halide layers and dye layers on a base, which process comprises exposing image-wise a photographic material, which has at least one light-sensitive silver halide emulsion layer, which can contain a diffusion-resistant, bleachable image dye, and immediately above it, on the side facing the light source, a silver halide-free layer containing a diffusion-resistant bleachable image dye, the light-sensitive silver halide emulsion layer and silver halide-free layer being free from a dye bleach catalyst and processing the material in a processing bath containing a dye bleach catalyst, to give a colour image, the colour image being produced exclusively by image dyes present in the photographic material prior to exposure. ### Claim 2 (depends on 1) A process according to claim 1, wherein the same image dye is used in the silver halide-containing layer and in the adjacent silver halide-free dye layer. ### Claim 3 (depends on 2) A process according to claim 2, wherein the image dye is a cyan dye, magenta dye or a yellow dye. ### Claim 4 (depends on 3) A process according to claim 3, wherein the photographic material contains 3 pairs each comprising a silver halide-containing dye layer and an adjacent silver halide-free dye layer, each of the pairs of layers containing one of the image dyes cyan, magenta or yellow. ### Claim 5 (depends on 4) A process according to claim 4, wherein the photographic material can contain additional protective layers, separating layers or filter layers. ### Claim 6 (depends on 5) A process according to claim 5, wherein the protective layers, separating layers and filter layers can contain a cyan dye, magenta dye or yellow dye. ### Claim 7 (depends on 6) A process according to claim 6, wherein the silver halide-free layers containing image dye can serve as protective layers. ### Claim 8 (depends on 7) A process according to claim 7, wherein the photographic material comprises coated on a support a gelatin subbing layer, a red-sensitive emulsion layer containing a cyan dye, an emulsion-free layer containing a cyan dye, a silver halide-free layer containing a magenta dye, a green sensitive emulsion layer containing a magenta dye, a layer containing a magenta dye, a silver halide-free layer containing a yellow dye, a blue-sensitive emulsion layer containing a yellow dye and a gelatine protective layer. ### Claim 9 (depends on 1) A process according to claim 1, wherein the light-sensitive silver halide emulsion is sensitised in such a way that is sensitivity maximum matches the absorption maximum of the corresponding image dye. ### Claim 10 (depends on 1) A process according to claim 1, wherein the light-sensitive silver halide emulsion is sensitised in such a way that its sensitivity maximum does not match the absorption maximum of the image dye. ### Claim 11 (depends on 1) A process according to claim 1, wherein a cubic-monodisperse silver halide emulsion is used in at least one light-sensitive layer. ### Claim 12 (depends on 1) A colour photographic material for the silver dye bleach process, suitable for use in the process according to claim 1, which has the composition stated in claim 1. ### Claim 13 (depends on 12) A colour photographic material for the silver dye bleach process according to claim 12, wherein the silver halide-free dye layer located above the silver halide emulsion layer of a layer pair absorbs scattered light. ### Claim 14 (depends on 1) The colour images produced by a process according to claim 1.