Eastman-kodak Company

Philip J Coldrick

John Demita Goddard

Dawn J Jenkins

Rebecca Glen

John R Fyson

Christopher B Rider

Julie Baker

Llewellyn J Leyshon

Roger H Piggin

Nicholas A Pightling

Julia Pich

David Beaumond

Judith A Bogie

Ian Barford

Janet Linda Menton

High contrast photographic element containing a novel combination of nucleators

High contrast photographic element containing a novel nucleator

The invention relates to an ultrahigh contrast photographic material comprising a support bearing a silver halide emulsion layer, containing a hydrazide nucleating agent in the emulsion layer or a hydrophilic colloid layer, characterized in that the nucleating agent is a dimeric molecule comprising two monomers linked by a linking group, each monomer of which (a) may be the same or different and (b) comprises an acylhydrazide moiety and a nicotinamide moiety in combination, the material providing unexpectedly good nucleation in the absence of, or with reduced amounts of, booster and in a developer whose pH is variable, and further with lower chemical spread and pepper fog.

The invention relates to an ultrahigh contrast photographic material comprising a support bearing a silver halide emulsion layer, containing a hydrazide nucleating agent in the emulsion layer or a hydrophilic colloid layer, characterised in that the nucleating agent is a dimeric molecule comprising two monomers linked by a linking group, each monomer of which (a) may be the same or different and (b) comprises an acylhydrazide moiety and a nicotinamide moiety in combination, the material providing unexpectedly good nucleation in the absence of, or with reduced amounts of, booster and in a developer whose pH is variable, and further with lower chemical spread and pepper fog.

Photographic materials are processed using a processing solution that is replenished at a rate controlled by an algorithm that has terms determined by information associated with the photographic material.

Photographic processing

Photographic high contrast silver halide materials

High contrast graphic arts photographic materials exhibiting improved accuracy in image reproduction are comprised of a support, a silver halide emulsion layer having a chloride content of at least 50 mole percent, and a non-electroconductive hydrophilic colloid layer containing both a vinyl polymer and a hydrophilic colloid interposed between the support and the silver halide emulsion layer. A hydrazine nucleating agent is incorporated in or adjacent to the silver halide emulsion layer and the photographic material preferably also contains an amino compound which functions as a booster.

Photographic high-contrast silver halide materials

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Twickenham, United Kingdom

Philip J Coldrick