Minnesota Mining and Manufacturing Company

Jonathan P Kitchin

Mark P Kirk

Dian E Stevenson

Randall H Helland

Keith A Penfound

Stephen R Powers

Peter J Finn

Kumars Sakizadeh

George V Tiers

William Donald Ramsden

Roger A Mader

Terence D Spawn

Michael G Fisher

Mark B Mizen

Richard A Newmark

Sylvia A Farnum

Carlo Marchesano

Paolo Beretta

Ronald W Burrows

Kevin P Hall

Bernard A Lea

William C Frank

Robert F Coles

A thermal-dye-bleach construction comprising a dye in association with a thermal dye-bleaching agent of general formula I: ##STR1## wherein: each of R.sup.a and R.sup.b are individually selected from: hydrogen, an alkyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, an aryl group, and a heterocyclic group, and preferably, both R.sup.a and R.sup.b represent hydrogen;

Tetra-alkylammonium phenylsulfonylacetate thermal-dye-bleach agents

A thermal-dye-bleach construction comprising a polymethine dye having a nucleus of general formula I: ##STR1## in association with a thermal-carbanion-generating agent having the general formula: ##STR2## wherein the substituents are as defined in the specification and claims.

Thermal-dye-bleach construction comprising a polymethine dye and a

A photographic element containing a thermal-dye-bleach construction includes a thermal nucleophile-generating agent in association with a polymethine dye having a nucleus of general formula (I): ##STR1##

Photographic element containing a thermal dye bleach system

A thermal-dye-bleach construction comprising a thermal nucleophile-generating agent in association with a polymethine dye having a nucleus of general formula (I): ##STR1## in which: n is 0, 1, 2 or 3;

Thermal dye bleach construction

A process for producing a continuous tone color image comprising providing a light sensitive photographic element comprising a substrate bearing three imaging media coated thereon, said imaging media comprising:

Continuous tone color imaging using laser or light emitting diode sources

A radiation-sensitive element for half tone color proofing adapted to be exposed by scanning with four independently modulated sources of radiation emitting at different wavelengths within the range 550 to 900 nm, the element comprising a substrate bearing at least four separate imaging media coated thereon, said imaging media including:

Photographic color proofing apparatus

High contrast negative images are obtained by developing a silver halide photographic element, in the presence of a hydrazine compound, with an alkali aqueous developing solution which contains a combination of developing agent comprising hydroquinone or substituted hydroquinone and a superadditive developing agent and an antioxidant, wherein the developing solution has a pH lower than about 12 and wherein the silver halide photographic element comprises an emulsion layer including surface latent image negative type silver halide grains in reactive association with a contrast promoting agent, preferably a diarylcarbinol compound, more preferably a diarylmethanol compound in a quantity useful to increase contrast.

Process for the formation of high contrast negative images and silver

A negative-acting photographic element comprising a support having coated thereon one or more layers of a radiation-sensitive silver halide emulsion, at least one of the layers containing a hydrazine compound in which the one or more radiation-sensitive silver halide layers contain a first silver halide emulsion having an average grain size of from 0.1 to 0.4 microns and a second silver halide emulsion of particles with an average grain volume of less than one half that of the particles of the first emulsion.

Silver halide radiation-sensitive photographic materials

Photographic materials and color proofing system

A photographic element of the conventional wet processed type or of the dry silver type which includes an antihalation or acutance dye which absorbs in the near infrared and has a relatively low visible absorption while retaining a high extinction coefficient at .sub.max. The dye is of the general formula: ##STR1## in which: m+p=2,

Photographic elements incorporating antihalation and/or acutance dyes

A photographic process for providing a silver image enhanced by the presence of a dye in which a substantially insoluble silver salt is formed from fixed silver prior to color development in the presence of a color coupler or a dye-forming developing agent.

Photographic process

Cyanine dyes including two nitrogen containing heterocyclic nuclei, linked to each other through a rigidized conjugated 7, 9 or 11 carbon atom methine chain to form an amidinium-ion resonance system, are very good for sensitizing silver halide emulsions for use in photographic elements to be exposed to infrared radiation if one of said heterocyclic nuclei is 5-methyl-6-methoxy-benzothiazole.

Cyanine dyes for sensitizing silver halide emulsions to infrared

Many photographic materials must be handled under special lighting conditions in order to prevent exposure of the material. The use of large concentrations of bleachable light absorbing layers over the photosensitive emulsion tends to leave an undesirable residual stain. The inclusion of a specific class of low intensity reciprocity failure inducers to silver halide emulsions enables the emulsions and their photographic articles to be safely handled under white light conditions.

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Hertford, United Kingdom

Jonathan P Kitchin