Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Positive
Patent
1994-06-29
1996-01-02
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Post imaging processing
Positive
430264, 430598, G03C 5305
Patent
active
054807700
ABSTRACT:
The present invention provides a method for making direct-positive photographic images comprising the steps of image-wise exposing a photographic light-sensitive silver halide material comprising a support and a layer of an internal latent image-type silver halide emulsion the pAg of which has been adjusted to a value of at least 8.5 before coating, and developing said exposed photographic silver halide material in a surface developer in the presence of at least one development nucleator which is not able to react with but which is able to adsorb weakly on the surface of the silver halide emulsion crystals prior to development, but which contains a group protected against reaction with silver halide and which is transformed during development in a nucleating derivative with an enhanced reactivity for the silver halide crystals. Photographic materials comprising these novel development nucleators are also described.
REFERENCES:
patent: 4245037 (1981-01-01), Tsujino et al.
patent: 4266013 (1981-05-01), Adachi et al.
patent: 4880729 (1989-11-01), Heki et al.
patent: 5288590 (1994-02-01), Kuwabara et al.
Dewanckele Jean-Marie
Terrell David
Viaene Kris
Agfa-Gevaert N.V.
Bowers Jr. Charles L.
Huff Mark F.
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