Agfa-gevaert Ag

Agfa-gevaert Aktiengesellscaft

Manfred Becker

Reinhart Matejec

Sieghart Klotzer

Hans Hlschlager

Bruno Mucke

Erik Moisar

Heinrich Odenwalder

Manfred Peters

Harald Von Rintelen

Kaspar Wingender

Lothar Endres

Thomas Kaluschke

Gunther Mahlberg

Roswitha Ullrich

Angela Slabik

Hans-Joerg Metz

A photosensitive silver halide material comprising a support and at least one photosensitive silver halide emulsion layer, of which the emulsion contains an effective quantity of at least one compound from each of at least two classes A, B, C and D defined hereinafter:

Silver halide recording material

Improved photographic recording materials contain silver halide grains having at least two zones differing in their halide composition and, as stabilizer, a compound corresponding to the formula ##STR1##

Photographic recording material and process for the production of

A heat developable color photographic recording material is improved in its D.sub.min /D.sub.max ratio and sensitivity if it contains a silver halide emulsion in which the grains have at least three zones differing in their silver halide composition.

Color photographic recording material developable by heat

The sensitivity of highly sensitive color photographic recording materials may be enhanced by compounds releasing fogging or development accelerating compounds as a result of a reaction with color developer oxidation products and fogging may at the same time be reduced by using compounds corresponding to formula I as silver halide stabilizers: ##STR1## wherein Z denotes the atoms required for completing an oxazole or oxazine ring and

Color photographic recording material

Improved silver halide emulsions are obtained by the combined use of an iridium compound and an imidazole before termination of crystal growth.

Color photographic recording material containing a silver halide

Photographic recording materials containing a silver halide emulsion in which the grains have zones of differing iodide content provide improved sensitometric results.

Photographic recording material

Surface-sensitized silver halide grains having a core/shell structure show improved properties.

Photographic silver halide emulsion

A photographic material with at least one light-sensitive silver halide emulsion is disclosed. The emulsion has been prepared by carrying out the precipitation of the silver halide in the presence of certain imidazoles.

Light-sensitive photographic material

A black and white developer solution containing o- or p-N-(2-hydroxyethyl)aminophenol as developer substance and a piperazine derivative of the formula ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 denotes substituents as described hereinafter capable of developing a certain quantity of film e.g. 10 roll films per liter successively to substantially constant gamma values.

Photographic developer

High sensitive silver halide emulsions are obtained by the production of a new kind of sensitivity nuclei which are called troglodyte nuclei and which are described hereinafter.

Growing community of inventors

Leverkusen, Germany

Manfred Becker