Black and white direct positive image forming process

Details Black and white direct positive image forming process Black and white direct positive image forming process

1992-07-16

1994-02-22

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Positive

430441, 430465, 430485, 430487, G03C 5305

Patent

active

052885968

ABSTRACT:
A black and white direct positive image forming process is disclosed. The process comprises imagewise exposing to light a silver halide light sensitive material and developing the material with a black and white developing solution. The light-sensitive material comprises a non-pre-fogged internal latent image type silver halide emulsion layer provided on a support. The material further contains a quaternary salt nucleating agent and a nucleating accelerator. In the present invention, the black and white developing solution contains an imidazole compound and a benzotriazole compound. The amount of the benzotriazole compound is preferably in the range of 0.1 to 10 wt.% of the amount of the imidazole compound. The black and white direct positive image is preferably formed on a computer output microfilm (COM).

REFERENCES:
patent: 3808003 (1974-04-01), Hara et al.
patent: 5035984 (1991-07-01), Hayashi et al.
patent: 5112732 (1992-05-01), Hayashi et al.

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