Minnesota Mining and Manufacturing Company

Robert L Rutledge

Ronald S Steelman

Gerard H Kinderman

A process for forming a colloid relief image on a substrate, comprising the steps of: (a) exposing to actinic light a sheet structure comprising a substrate having coated on one surface thereof a first layer comprising a colloid material capable of being tanned when contacted by oxidized silver halide developer, and coated over the first layer a second layer comprising a photographic silver halide emulsion, the emulsion containing substituted gelatin which is substantially resistant to tanning by the oxidized silver halide developers; (b) developing exposed sheet structure with oxidizable silver halide developers; and (c) washing the sheet structure with warm water, whereby all of the second layer is removed together with portions of the first layer which have not been tanned.

Colloid relief images formed by oxidized developer transfer

An article comprising a substrate having coated on one surface thereof a first layer comprising a colloidal material capable of being tanned when contacted with oxidized silver halide developers, and overyling said first layer a second layer comprising a photographic silver halide emulsion, said emulsion containing substituted gelatin therein, said substituted gelatin being substantially resistant to tanning when contacted by said oxidized silver halide developers.

Colloid relief images by oxidized developer transfer

A presensitized photographic speed light sensitive sheet structure suitable for producing a dry transfer element, comprising a substrate having a release coating thereon, and overlying the release coating a photo-sensitive layer comprising a silver halide emulsion. After light exposure to an original and development, the remaining silver image portions have a greater adhesion for a receptor surface when applied thereto under pressure than the adhesion of the indicia to the substrate under like pressure.

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Saint Paul, MN, United States of America

Robert L Rutledge