High contrast development of photographic elements

Details High contrast development of photographic elements High contrast development of photographic elements

1980-01-14

1981-05-26

Downey, Mary F.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430265, 430267, 430268, 430438, 430481, 430486, 430490, 430599, 430949, G03C 530

Patent

active

042699290

ABSTRACT:
High contrast development of photographic elements, such as lithographic films used in the field of graphic arts, is carried out in the presence of a hydrazine compound with an aqueous alkaline developing solution which has a pH of above 10 and below 12 and contains a dihydroxybenzene developing agent, a 3-pyrazolidone developing agent, a sulfite preservative, and a contrast-promoting amount of an amino compound. The developing solution combines the advantages of high capacity, a high degree of stability, and a long effective life, while providing excellent contrast and speed characteristics.

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patent: 4166742 (1979-09-01), Mifune
patent: 4168977 (1979-09-01), Takada
patent: 4172728 (1979-10-01), Sincius

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