Photographic developing solution and use thereof in the high...

Details Photographic developing solution and use thereof in the high... Photographic developing solution and use thereof in the high...

G - Physics

03

C

G03C 5/30 (2006.01) G01C 1/06 (2006.01)

Patent

CA 2092374

NOVEL PHOTOGRAPHIC DEVELOPING SOLUTION AND USE THEREOF IN THE HIGH CONTRAST DEVELOPMENT OF NUCLEATED PHOTOGRAPHIC ELEMENTS ABSTRACT OF THE DISCLOSURE An improved photographic developing solution is free of dihydroxybenzene developing agents such as hydroquinone, has a pH in the range of from 9.5 to 11.5 and comprises (1) an ascorbic acid developing agent, (2) an auxiliary super-additive developing agent and (3) a carbonate buffering agent in a concentration of at least 0.5 molar. The developing solution is broadly useful in black-and-white development but is most advantageously employed in a process for forming a high-contrast image utilizing a silver halide photographic element comprising a hydrazine compound which functions as a nucleating agent and an amino compound which functions as an incorporated booster. The developing solution is ecologically advantageous, exhibits excellent stability with respect to seasoning effects, and provides high speed and good upper scale contrast combined with a low level of pepper fog and a moderate degree of chemical spread.

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