Agfa Gevaert Nv

Jules Robert Berendsen

Robert J Pollet

Jozef Frans Willems

Paul J Coppens

Jos A Vaes

Rene M De Keyzer

Francis J Sels

Willy Joseph Vanassche

Herman Alberik Pattyn

Eric M Hoes

Antoon Leon Vandenberghe

Herman Adelbert Philippaerts

Rik Vandenbruwaene

The present invention provides an imaging element comprising in the order given on a hydrophilic surface of a support (i) an image receiving layer containing physical development nuclei and (ii) a photosensitive layer containing a silver halide emulsion being in water permeable relationship with said image receiving layer, characterized in that said photosensitive layer comprises a substituted or unsubstituted 1-phenyl-3-pyrazolidone in an amount between 0.2 mg/g and 15 mg/g of silver halide expressed as an equivalent amount of silver nitrate.

Storage stability of an imaging element for making a printing plate

A photographic material for the production of continuous tone silver images by the diffusion transfer reversal process using at least two independently prepared silver halide emulsions of different photo-sensitivity and having a silver halide composition as defined in the description, either in admixture in a single supported emulsion layer or coated on the same support as separate superposed emulsion layers.

Method and material for the production of continuous tone silver images

A method of developing an exposed lith-type silver halide emulsion is described wherein development takes place in the presence of a sulphonium compound corresponding to the formula: ##STR1## wherein: EACH OF X.sub.1 and X.sub.2 represents an alkyl group at least one of which carries a hydroxy, carboxy, sulpho or cyano group,

Development of exposed lith-emulsions

Direct-positive emulsions are described comprising incorporated developing agents wherein the developing agents are 1,4-dihydroxybenzene compounds of which at least one of the hydroxyl groups has been esterified to form a hydrolyzable aliphatic acyloxy group comprising a quaternary ammonium group.

Direct-positive silver halide emulsions having incorporated developers

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Deurne, Belgium

Jules Robert Berendsen