Process for forming direct-positive image

Details Process for forming direct-positive image Process for forming direct-positive image

1987-06-30

1989-10-03

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Positive

430410, 430598, 430567, 430940, G03C 1485, G03C 524

Patent

active

048716537

ABSTRACT:
A process for forming a direct-positive image by developing an imagewise exposed photosensitive material, having on a support at least one photographic emulsion layer containing nonprefogged silver halide grains capable of forming an internal latent image, in which development is carried out in the presence of a combination of a nucleating agent and at least one compound having at least one mercapto group selected from a tetrazaindene, a triazaindene, and a pentaazaindene. The hydrogen atom of which mercapto group may optionally be further substituted with an alkali metal atom or an ammonium group. The invention process provides rapid and consistent formation of direct-positive images having high maximum density and low minimum density.

REFERENCES:
patent: 4268621 (1981-05-01), Ogi et al.
patent: 4358528 (1982-11-01), Takagi et al.
patent: 4374923 (1983-02-01), Hirano et al.
patent: 4481285 (1984-11-01), Takagi et al.
patent: 4550070 (1985-10-01), Miyasaka et al.
patent: 4551419 (1985-11-01), Sugimoto et al.
Research Disclosure 16135, Sep. 1977.

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