Chemically stable ascorbate-based photographic developer and ima

Details Chemically stable ascorbate-based photographic developer and ima Chemically stable ascorbate-based photographic developer and ima

1996-01-23

1996-12-31

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Developer

430436, 430440, 430441, 430446, 430480, 430483, G03C 529

Patent

active

055893236

ABSTRACT:
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.

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patent: 5384232 (1995-01-01), Bishop et al.

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