Process for hard tone development of silver halide photographic

Details Process for hard tone development of silver halide photographic Process for hard tone development of silver halide photographic

1988-07-29

1989-09-05

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430268, 430436, 430438, 430441, 430446, 430486, 430487, 430490, G03C 530, G03C 526, G03F 706

Patent

active

048638307

ABSTRACT:
A process for hard tone development of a silver halide photographic light-sensitive material is described, comprising developing an imagewise exposed negative type silver halide photographic light-sensitive material in the presence of hydrazine, usig a developing solution comprising (1) a developing agent, (2) 0.25 mol/l or more of sulfite and (3) a compound represented by the general formula (I) and having a pH value of 10.5 to 12.3: ##STR1## wherein R.sub.1 and R.sub.2 represent each an alkyl group of R.sub.1 and R.sub.2 may form a ring by linking each other, R.sub.3 represents an alkyl group, an aryl group or a heterocyclic group, and R.sub.1, R.sub.2 and R.sub.3 may have substituents, A represents an alkylene group which may be substituted, and X represents --CONH--, --OCONH--, --NHCONH--, --NHCOO--, --COO--, --OCO--, --CO--, --NHCO--, --SO.sub.2 NH--, --NHSO.sub.2 --, --SO.sub.2 --or --O--.

REFERENCES:
patent: 3333959 (1967-08-01), Hayakawa
patent: 3345175 (1967-10-01), Hayakawa
patent: 4269929 (1981-05-01), Nothnagle

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