Ruthenium containing photographic developers

Details Ruthenium containing photographic developers Ruthenium containing photographic developers

1975-12-29

1976-06-22

Kelley, Mary F.

Gas separation: apparatus

Electric field separation apparatus

Including gas flow distribution means

96 66HD, 96 66R, G03C 530

Patent

active

039649121

ABSTRACT:
A composition is disclosed useful in developing silver halide photographic elements containing specifically selected developing agents for silver halide and a ruthenium(II) or ruthenium(III) cationic complex as a development accelerator. The ruthenium complex includes a predominance of amine or ammine ligands. Each of the developing agents exhibits an induction period in the absence of the ruthenium complex in excess of about 5 seconds. Polyhydroxybenzene, ascorbic acid, hydroxylamine, hydroxyurea and pyrimidine developing agents are representaive of those which are useful in the practice of my invention. A method of accelerating photographic development using the above composition is also disclosed.

REFERENCES:
patent: 3748138 (1973-07-01), Bissonette
patent: 3765891 (1973-10-01), Travis
patent: 3862842 (1975-01-01), Bissonette

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