G - Physics – 03 – C
Patent
G - Physics
03
C
G03C 5/30 (2006.01) G03C 1/06 (2006.01) G03C 5/305 (2006.01)
Patent
CA 2195600
The invention comprises a process for forming a high contrast photographic image including the steps of imagaewise exposing a silver halide photographic element containing a hydrazine compound which functions as a nucleating agent, wherein the element is free of incorporated amine boosters. The exposed element is developed with a chemically stable aqueous alkaline developing solution that is free of dihydroxybenzene developing agents and has a pH between 9.5 and 11. The developing solution comprises an ascorbic acid developing agent; an auxiliary developing agent; and a combination of an alkali metal carbonate and an alkali metal borate comprising between 0.125 and 0.5 molar concentration of the carbonate and between 0.04 and 0.35 molar concentration of the borate.
ette invention décrit un procédé d'obtention d'une image photographique à contraste élevé qui comprend l'exposition d'un élément photographique du type halogénure d'argent, du côté de l'image, contenant un composé à base d'hydrazine agissant comme nucléant, ledit élément étant dépourvu d'un accélérateur aminé incorporé. L'élément exposé est développé grâce à une solution révélatrice alcaline aqueuse chimiquement stable qui ne contient pas d'agent révélateur du type dihydroxybenzène et dont le pH est compris entre 9,5 et 11. La solution révélatrice contient un agent révélateur du type à acide ascorbique, un agent révélateur auxiliaire et une combinaison d'un carbonate de métal alcalin et d'un borate de métal alcalin comprenant entre 0,125 et 0,5 mole de carbonate et entre 0,04 et 0,35 mole de borate.
Adkins John L.
Patel Dinesh P.
Mccarthy Tetrault Llp
Sun Chemical Corporation
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