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US 4,544,620 AGranted
Tannable multi-colored material
AssigneeMinnesota Mining and Manufacturing Company
InventorMichael T. Macioch
Life of this patent
Estimating the term…
Abstract
A photographic element for use in a method of multicolor image formation by tanning development is a layered structure comprising an optionally primed base support, a layer of colloidal silver, a layer of sensitized silver halide emulsion in gelatin free of hardener, and at least one colored pigment or dye dispersed therein which absorbs radiation.
Claims21
A tannable photographic element capable of providing a multi-colored image which is layered structure comprising
- a. a base support, and
- b. coated thereon in either order or in unitary layer,
- (1) a layer comprising colloidal silver having in the range of 0.05 to 1.5 g of Ag/m.sup.2, and
- (2) a layer comprising a light-sensitive silver halide emulsion in gelatin substantially free of hardener,
- at least one colored pigment or colored dye that absorbs radiation in the range of 300 to 1000 nm in sufficient quantity to provide a reflection or transmission optical density in the range of 1.0 to 5.0, said colored pigment or colored dye being dispersed in at least one of the colloidal silver and the light-sensitive layers;
- the total silver in said layer of light-sensitive emulsion and said colloidal silver layer being present in a quantity in the range of 0.5 g/m.sup.2 to 5 g/m.sup.2, and the gelatin of said emulsion layer being present in a quantity so as to provide a total silver/total gelatin weight ratio of less than 1.5.
3 more elements
A method for obtaining a colored image comprising the steps of:
- (a) providing the tannable photographic element which is a layered structure comprising:
- a base support, and coated thereon in either order or in a unitary layer
- (1) a layer comprising colloidal silver having in the range of 0.05 to 1.5 g of Ag/m.sup.2, and
- (2) a layer comprising a light-sensitive silver halide emulsion in gelatin substantially free of hardener,
- at least one colored pigment or colored dye that absorbs radiation in the range of 300 to 1000 nm in sufficient quantity to provide a reflection or transmission optical density in the range of 1.0 to 5.0, said colored pigment or colored dye being dispersed in at least one of the colloidal silver and the light-sensitive layers;
- the total silver in said layer of light-sensitive emulsion and said colloidal silver layer being present in a quantity in the range of 0.5 g/m.sup.2 to 5 g/m.sup.2, and the gelatin of said emulsion layer being present in a quantity so as to provide a total silver/total gelatin weight ratio of less than 1.5,
- (b) exposing said element to radiation in the range of 300 to 1000 nanometers,
- (c) contacting the exposed element with an aqueous activator solution having a pH of at least 9.5,
- (d) removing unexposed portions of the coated gelatin-containing layers to provide an image,
- (e) drying the resulting primary color-imaged element,
- (f) subjecting said resulting primary color image in whole or in part to a bleach-fix solution for a time sufficient to reduce said primary color image to a colorless or changed form and allow a secondary colored image to become visible, and
- (g) drying the resulting colored imaged element.
9 more elements
Dependencies are inferred from the claim text.