Process for the formation of high contrast negative images...

Details Process for the formation of high contrast negative images... Process for the formation of high contrast negative images...

G - Physics

03

C

96/100

G03C 1/10 (2006.01) G03C 1/06 (2006.01)

Patent

CA 1310533

Process For The Formation Of High Contrast Negative Images And Silver Halide Photographic Element ABSTRACT OF DISCLOSURE High contrast negative images are obtained by devel- oping a silver halide photographic element, in the pres- ence of a hydrazine compound, with an alkali aqueous de- veloping solution which contains a combination of develop- ing agent comprising hydroquinone or substituted hydroqui- none and a superadditive developing agent and an antioxi- dant, wherein the developing solution has a pH lower than about 12 and wherein the silver halide photographic ele- ment comprises an emulsion layer including surf ace latent image negative type silver halide grains in reactive asso- ciation with a contrast promoting agent, preferably a di- arylcarbinol compound, more preferably a diarylmethanol compound in a quantity useful to increase contrast.

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