Method of developing direct positive silver halide material

Details Method of developing direct positive silver halide material Method of developing direct positive silver halide material

1991-08-14

1992-10-13

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Positive

430410, 430415, 430438, 430448, 430464, 430481, 430484, 430485, 430486, 430490, G03C 526

Patent

active

051550148

ABSTRACT:
Method for the production of direct-positive images by image-wise exposing a light-sensitive silver halide material comprising a support and an internal latent image-type silver halide emulsion layer and developing said exposed material in the presence of at least one development nucleator and density-increasing amounts of a compound chosen from the class consisting of formic acid, oxalic acid, glyoxylic acid, or salts of these and/or of a compound chosen from the class consisting of polyethylene glycols, with a hydroquinone-type developing solution having a pH not higher than 12.0 and comprising less than 25 g per liter of a hydroquinone and 5 to 100 g per liter of at least one alkanolamine.

REFERENCES:
patent: 1925557 (1933-09-01), Dundon
patent: 2915394 (1959-12-01), Krizka
patent: 4416969 (1983-11-01), Magee et al.
patent: 4444871 (1984-04-01), Miyaoka et al.
patent: 4789627 (1988-12-01), Inoue et al.
patent: 4877723 (1989-10-01), Hirano et al.

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