Reducing post-process d-min increase in positive redox...

Details Reducing post-process d-min increase in positive redox... Reducing post-process d-min increase in positive redox...

G - Physics

03

C

96/207, 96/33

G03C 8/08 (2006.01) G03C 8/00 (2006.01)

Patent

CA 1203105

Abstract of the Disclosure Photographic elements and assemblages are described employing positive-working redox dye- releasers, wherein the element contains an oxidant which is located between the support and the photo- sensitive portion thereof. The oxidant has an electrode potential of from about -200 mV up to about 1200 mV versus a saturated calomel electrode at a pH of about 5 to about 6. After processing, the oxidant reacts with the electron transfer agent to prevent it from reacting with the dye releaser which would otherwise cause further dye release. The reduced form of the oxidant is then substantially incapable of reducing the positive-working redox dye-releaser. Dmin stability is thereby improved.

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