Method for forming direct positive image comprising developing w

Details Method for forming direct positive image comprising developing w Method for forming direct positive image comprising developing w

1987-09-01

1989-11-14

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Positive

430598, G03C 524, G03C 148

Patent

active

048807290

ABSTRACT:
A method for forming a direct positive image by the steps of (a) imagewise exposing a light-sensitive material including a support having thereon at least one photographic emulsion layer containing a nonprefogged silver halide capable of forming an internal latent image and (b) developing the exposed material in the presence of a nucleating agent containing a combination of at least one quaternary heterocyclic compound and at least one hydrazine compound. The resulting direct positive has sufficiently high maximum density and low minimum density, and satisfactory stability over time.

REFERENCES:
patent: 3761276 (1973-09-01), Evans
patent: 4115122 (1978-09-01), Adachi et al.
patent: 4255511 (1981-03-01), Hirano et al.
patent: 4276364 (1981-06-01), Leone
patent: 4323643 (1982-04-01), Mifune et al.
patent: 4481285 (1984-11-01), Takagi et al.
patent: 4550070 (1985-10-01), Miyasaka et al.

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