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公开(公告)号:US3615440A
公开(公告)日:1971-10-26
申请号:US3615440D
申请日:1968-10-25
Applicant: POLAROID CORP
Inventor: BLOOM STANLEY M , CRAMER RICHARD D
Abstract: Substituted reductic acid compounds and preferably, tetrasubstituted reductic acid compounds are used as developing agents for silver halide emulsions in photographic processes, particularly diffusion transfer processes.