Superhigh contrast negative image forming process

Details Superhigh contrast negative image forming process Superhigh contrast negative image forming process

1991-09-18

1993-06-08

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430266, 430267, 430436, 430480, 430487, 430489, 430603, 430602, 430448, 430434, G03C 106

Patent

active

052178420

ABSTRACT:
A process of forming superhigh-contrast negative images is disclosed. The process comprises the steps of imagewise exposing a substantially surface latent image-type silver halide photographic material which is spectrally sensitized with a sensitizing dye and then developing said photographic material with a developer, wherein said photographic material contains a heterocyclic thione compound and said developer comprises (a) an aminophenol derivative developing agent, (b) a reductone compound, (c) a quaternary ammonium salt, and (d) a compound represented by formula (I): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3, which may be the same or different, each represents a hydrogen atom, a nitro group, a halogen atom, or a cyano group, and wherein said development processing is carried out in the existence of at least one kind of a polyalkylene oxide or a derivative thereof. The process provides negative images of superhigh contrast having gamma over 10 substantially free from appearance of pepper.

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The Theory of the Photographic Process, Fourth Ed., 1977, p. 303, right column, lines 21-40.

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