Photographic developing solution and use thereof in the high con

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

1992-12-14

1993-11-23

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430435, 430436, 430440, 430441, 430478, 430480, 430492, G03C 106

Patent

active

052643239

ABSTRACT:
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.

REFERENCES:
patent: 2688548 (1954-09-01), Reynolds et al.
patent: 2688549 (1954-09-01), James et al.
patent: 3022168 (1962-02-01), Stjarnkvist
patent: 3512981 (1970-05-01), Prchal et al.
patent: 3870479 (1975-03-01), Kubotera et al.
patent: 3942985 (1976-03-01), Newman et al.
patent: 4478928 (1984-10-01), Hess et al.
patent: 4650746 (1987-03-01), Simson et al.
patent: 4914003 (1990-04-01), Yagihara et al.
patent: 4975354 (1990-12-01), Machonkin et al.
patent: 5030547 (1991-07-01), Katoh et al.
patent: 5098819 (1992-03-01), Knapp
patent: 5126227 (1992-06-01), Machonkin et al.
patent: 5196296 (1993-03-01), Meens et al.

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