Eastman-Kodak Company

Maurice E Pfaff

Claude G Goumont

Marcel A Compere

Roger M Baralle

Frederic X Jordi

Francois Jean-Marie Bredoux

Pierre Amedee Roman

Regis Thomas

Rene Jean Dennilauler

The invention relates to a reversal color photographic print material. Said reversal material comprises a support with, in order, a substantially light-insensitive fine grain emulsion layer which does not take part in the image formation, a red-sensitive emulsion layer having associated therewith a cyan-forming compler, a green-sensitive emulsion having associated therewith a magenta-forming coupler, a blue-sensitive emulsion having associated therewith a yellow-forming coupler. This arrangement allows to adjust the shape of the characteristic curve of red, green, blue-sensitive emulsion layers.

Reversal color photographic material with a fine grain sublayer

A reversal photographic element comprising at least two dye image-forming units, at least one unit comprising

Color image-forming photographic reversal element with improved

Silver halide emulsions are disclosed containing silver halide grains capable of forming an internal latent image. Incorporated in the emulsions is a diphenylmethane nucleating agent, thereby permitting a direct-positive image to be formed on imagewise exposure and photographic processing.

Photographic emulsions and elements capable of forming direct-positive

Silver halide emulsions are disclosed containing silver halide grains capable of forming an internal latent image. Incorporated in the emulsions as a nucleating agent is a heterocyclic compound having an arylaminovinylene or aryloxyvinylene substituent, thereby permitting a direct-positive image to be formed on imagewise exposure and photographic processing.

Silver halide emulsions are disclosed containing silver halide grains capable of forming an internal latent image. Incorporated in the emulsions as a nucleating agent is a dihydrospiropyran bis-condensation product of salicylic aldehyde and at least one heterocyclic ammonium salt, thereby permitting a direct-positive image to be formed on imagewise exposure and photographic processing.

The use of a 4-thiohydantoine in combination with an image-wise exposed diffusion transfer element comprising a negative silver halide emulsion layer and an associated physical development layer containing cadmium sulfide nuclei and an associated initially immobile dye-providing substance provides improved diffusion transfer dye images.

Color diffusion transfer employing silver salt transfer reversal and

The use of a soluble, reducible silver salt in combination with an imagewise exposed diffusion transfer photographic element comprising a negative silver halide emulsion and an associated physical development nuclei layer provides a resultant photographic image having intensified maximum density areas with little or no effect on minimum density areas.

Imagewise soluble silver salt intensification of diffusion transfer

Tanning (hardening) agents in a colloid layer of gelatin or the like are inactive at ordinary temperatures but are activated at temperatures above 70.degree.C. to rapidly tan the colloid in which they are incorporated. Suggested uses are in thermography and photography. Specific examples describe various gelatin layers containing the heat-activated hardeners. The class of useful tanning agents is described by the formula ##SPC1## Wherein the substituents R and R' are selected from hydrogen and halogen atoms and alkyl, carboxyl, alkoxy, formyl, tertiary amino and sulfo radicals. Some specific new compounds of this class are described.

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Le Perreux-sur-Marne, France

Maurice E Pfaff