Agfa-gevaert Ag

Agfa Gevaert Nv

Anita Von Konig

Franz Moll

Werner Liebe

Wilhelm Saleck

Edith Weyde

Gerhard Jager

Heinrich Odenwalder

Artur Botta

Christian Rasp

Lothar Rosenhahn

Helmut Kampfer

Herman Adelbert Philippaerts

Werner Berthold

Armin Voigt

Karl H Buchel

Hermann Hagemann

Klaus Sasse

Ernst Roos

Hubertus Psaar

Robert J Pollet

Helmut Timmler

Hans Hlschlager

Manfred Peters

Walter Puschel

Luc A De Brabandere

Walter Patzold

Karl Lohmer

Friedhelm Sommer

Walter Gauss

Frans Clement Heugebaert

Theofiel H Ghys

Wolfgang Muller-Bardorff

Herbert Gernet

Karl H Mayer, Deceased

Kurt Ley

Eric Maria Brinckmann

Johannes Hartl

Siegismund Schutz

Jurgen Stoltefuss

Color photographic images are produced by decomposing hydrogen peroxide on nuclei present in imagewise distribution and bleaching out a dye by the hydrogen peroxide on those parts of the image where no such nuclei are present.

Process for the production of color photographic images and photographic

New triazoles of the formula ##STR1## are suitable stabilizing agents in photographic materials.

Photographic material, process for the production thereof, process for

Pyrazoles of the formula ##STR1## are useful as stabilisers in photographic materials.

Photographic material containing a stabilizer, a process for its

Compounds of the formula ##STR1## wherein the substituents have the meaning indicated in the specification are suitable as latent image stabilizer in silver halide materials.

Photographic material, process for the production thereof and process

Compounds of the formula ##STR1## are useful as stabilizers in photographic materials.

Photographic emulsion with stabilizer process for its preparation,

Propyne compounds, which are capable of stabilizing photographic materials against fog, color fog and flattening of the gradation are disclosed. They may be added to emulsion layers and to processing baths.

Photographic material containing a stabilizing agent

A photographic material for the production of an image in a dry process by forming a vesicle image upon the decomposition of a peroxide compound at image nuclei of silver by providing a layer containing a silver salt which forms upon exposure to light, in imagewise distribution, image nuclei. The silver salt has a grain size of less than 0.3 .mu.m and is present in the layer in an amount of from 1-500 mg/m.sup.2.

Silver salt photographic material for the production of silver and

Propyne compounds, which are capable of stabilizing photographic materials against color fog and flattening of the gradation are disclosed. They may be added to emulsion layers and to processing baths.

Photographic material containing a stabilizer

Process for the preparation of silver images by imagewise exposure of a photographic material comprising at least one light-sensitive silver halide emulsion layer and treatment of the material with a developer composition, wherein the improvement comprises the development is carried out in the presence of 3-mercapto-5-(2-furyl)-1,2,4-triazole. The 3-mercapto-5-(2-furyl)-1,2,4-triazole decreases the fog during development, and when this is the first development in a black-and-white or color reversal process, increases the reversal silver or color density.

Photographic material with improved properties

Stabilizing baths used in rapid reproduction processes of photographic elements which comprise stabilizers, hardening additives and corrosion preventatives are improved in that certain heterocyclic compounds are incorporated in the baths. Excellent protection against corrosion is attained without a deleterious effect on the quality of the photographic material.

Corrosion preventative for two-bath stabilizer baths

Fine-grain silver halide emulsions of the Lippmann-type are described which comprise derivatives of heterocyclic mercaptans corresponding to the formulae: ##STR1## wherein: each of Z.sub.1 and Z.sub.2 represents the atoms necessary to complete a 5- or 6-membered heterocyclic ring system,

Photographic Lippmann emulsions

Positive images including color images are obtained by imagewise exposure and development of a material which comprises at least one light-sensitive silver halide emulsion layer which contains an unfogged direct-positive silver halide emulsion, when the development is carried out in the presence of a fogging agent of the formula ##STR1## wherein the symbols are defined as hereinafter. The fogging agent is preferably contained in a layer of the material and more preferably in the unfogged direct-positive silver halide emulsion layer. For the production of color instant images the material may also contain non-diffusible color providing compounds capable in their oxidized form of being split under alkaline photographic development conditions to release diffusible dyes.

Process for the production of direct-positive photographic images

The process for the preparation of silver dispersions for antihalation and filter layers in photographic material by reducing silver salts in the presence of a heterocyclic 5-membered or 6-membered compound which has a ##STR1## group in its 1,2,3-position and a 2-aminoalkyl or 2-hydroxyalkyl group or an alkylene chain which is linked through the 1- and 2-position. The process provides neutral grey silver dispersions without using cadmium salts, for the reduction of the silver salts.

Process for the preparation of silver dispersions for filter layers and

A photographic silver halide material containing a new stabilizer compound which is an aromatic compound containing in ortho position two bridging members which are linked to form a spiro structure with a 2'-imidazolidine-4',5'-dione as defined hereinafter.

Color photographic materials with spiro heterocyclic stabilizing agents

The production of an image in a dry process by forming a vesicle image upon the decomposition of a peroxide compound at image nuclei of silver by providing a layer containing a silver salt which forms upon exposure to light, in imagewise distribution, image nuclei. The silver salt has a grain size of less than 0.3 .mu.m and is present in the layer in an amount of from 1 - 500 mg/m.sup.2.

Growing community of inventors

Krefeld, Germany

Anita Von Konig