G - Physics – 03 – C
Patent
G - Physics
03
C
96/194
G03C 7/04 (2006.01) G03C 7/28 (2006.01)
Patent
CA 1156870
Abstract Production of masked positive colour images by the sil- ver dye bleach process, by exposing a photographic material for the silver dye bleach process, silver developing, dye- bleaching, silver-bleaching and fixing, optionally, the step of silver-bleaching is carried out in a combined treatment bath together with dye-bleaching and/or fixing. A photographic material is used which contains (a) in at least one layer, at least one first bleachable image dye, which has at least one undersired colour density which is to be compensated, (b) in the layer or layers (a) and/or in a layer adjacent to the said layer or layers (a), an iodine-containing silver halide emulsion allocated to the said dye or to each of the said dyes, (c) in at least one further layer, at least, in each case, a second dye, the main colour density of which corresponds to the secondary colour density of the first dye or dyes which is to be compensated, (d) in the layer or layers (c) and/or in a layer or layers adjacent to the said layer or layers (c), a silver halide emulsion which is free from iodine or has a low iodine content com- pared with the emulsion mentioned under (b) and is allo- cated to the said dye or dyes, and (e) in at least one layer (c) and/or in at lest one further layer which is adjacent to the layer or layers (c) and which is separated from one or more layers (a) by at least one interlayer, a fogged silver halide emulsion which is free from iodine or has a low iodine content, is spontaneously developable to maxi- mum density without exposure and contains a development retarder. Developing is carried out in a developer solution which does not contain any silver complexing agents. The resulting colour images display outstanding colour reproduction.
357439
Boragine Carlo
Mollet Herbert
Oetiker Alfred
Ag Ciba-Geigy
Gowling Lafleur Henderson Llp
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