G - Physics – 03 – C
Patent
G - Physics
03
C
96/194
G03C 7/04 (2006.01) G03C 1/76 (2006.01) G03C 7/28 (2006.01)
Patent
CA 1071456
PROCESS FOR THE PRODUCTION OF MASKED POSITIVE COLOUR IMAGES BY THE SILVER DYE BLEACH PROCESS Abstract of the Disclosure The present invention relates to a process for the production of masked subtractive positive colour images in accordance with the silver dye bleach process. In the material to be processed (a) a silver halide emulsion layer consisting at least partially of silver iodide is allocated to the dyestuff, of which the undesired parasitic colour density is to be compen- sated, (b) in a further layer, at least one second dyestuff, of which the main colour density corresponds to a parasitic colour density, requiring compensation, of the first dyestuff, and a silver halide emulsion free from iodide ions, are present, (c) a further layer, which is adjacent to that containing the second dyestuff, contains colloidal nuclei which are ca- pable of depositing metallic silver from soluble silver com- plexes, (d) a separating layer is present between the layer con- taining the nuclei and the dyestuff layer, of which the parasitic -1- colour density is to be compensated. The silver developer bath, with which the material is treated contains a ligand, which is able to produce water-soluble silver complexes which are capable of diffusion. -1-A
238170
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