Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Positive
Patent
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.
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Heki Tatsuo
Hirano Shigeo
Inoue Noriyuki
Doody Patrick A.
Fuji Photo Film Co. , Ltd.
Michl Paul R.
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