G - Physics – 03 – C
Patent
G - Physics
03
C
96/185, 96/35
G03C 7/00 (2006.01) G03C 7/28 (2006.01)
Patent
CA 1148402
ABSTRACT OF THE DISCLOSURE A new method to produce photographic images is provided which comprises (a) imagewise exposing a photographic assembly which contains at least during the silver halide halides developing step, in order optionally a supercoat layer, at least one silver halide emulsion layer, a layer containing a substantive azamethine compound and a photobase, there being optionally one or more interlayers between each of said components (b) treating the exposed photographic assembly with an aqueous processing bath so as to provide in the silver halide emulsion layer or layers solution or dispersion of a bleach developer compound, thereby to develop the latent silver image in the silver halide emuslion(s), and (c) in the non-latent image areas allowing the bleach developer compound to diffuse in a counter-imagewise manner from the silver halide emulsion layer (s) to the layer containing substantive azamethine compound and there to bleach the com- pound to form dye image.
348064
Kessler Katerina
Psaila Alexander
Ag Ciba-Geigy
Gowling Lafleur Henderson Llp
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