Dye toning system
AssigneeRecognition Systems, Inc.
InventorVictor E. Kohn
Life of this patent
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Abstract
Disclosed herein is a system for selectively mordanting a dye to preselected areas of a black and white photographic silver image and rapidly removing all traces of the dye from the non-image areas. The system includes novel processing compositions to enable the entire process to be carried out rapidly with a minimum amount of equipment.
Claims26
A method of dye toning a metallic silver image on a photographic substrate which comprises
- contacting the image bearing surface of said substrate with an aqueous solution having a pH in the range 7.5 to 11.5 for a predetermined time period,
- removing said aqueous solution from said substrate,
- admixing an aqueous mordant solution having a pH in the range 7.5 to 11.5 and containing potassium ferricyanide and iodine with an aqueous colorant solution containing an effective amount for coloring an image area of said substrate of a preformed water dispersible dye selected from the group consisting of diphenylmethane, triphenylmethane, acridine, oxazine, thiazine, diazo, azine and rhodamine dyes which can be mordanted to a complex formed from said potassium ferricyanide, metallic silver and said iodine under aqueous alkaline conditions to yield a color processing solution having a pH in the range 7.5-11.5,
- applying said processing solution to a preselected portion of said substrate containing said metallic silver image and a background area for a predetermined time period,
- removing said color processing solution from said substrate,
- contacting the portion of said substrate treated with said color processing solution with an aqueous fixer solution having a pH of at least 7.5 and containing from about 10 to about 50% by weight of an organic solvent which is at least partially water soluble and at least 0.5% by weight of an alkali metal iodide, removing said fixer solution from said substrate, and
- drying said image bearing substrate.
A method of coloring preselected image areas of a metallic photographic silver image on a substrate which comprises
- applying to said preselected metallic silver image area a color processing solution having a pH in the range 7.5 to 11.5 and containing iodine, alkali metal ferricyanide, and an effective amount for coloring said image area of a preformed dye colorant selected from the group consisting of diphenylmethane, triphenylmethane, acridine, oxazine, thiazine, azine, diazo and rhodamine dyes which can be mordanted under aqueous alkaline conditions whereby
- a mordanting complex is formed from the metallic silver of the photographic image, said iodine, and said alkali metal ferricyanide, said mordanting complex having an affinity for said dye colorant.
A composition for dye toning a photographic metallic silver image which comprises an aqueous color processing solution having a pH in the range 7.5 to 11.5 and containing iodine, a ferricyanide complexing agent and an effective amount for coloring said silver image of a preformed water dispersible dye colorant selected from the group consisting of diphenylmethane, triphenylmethane, acridine, oxazine, thiazine, diazo, azine and rhodamine dyes which can be mordanted under alkaline conditions to a complex formed from said ferricyanide complexing agent, said metallic silver image and said iodine, said preformed dye colorant having an affinity for said complex.
A composition for coloring photographic metallic silver images which comprises an aqueous coloring solution having a pH in the range 7.5 to 11.5 formed by mixing a first aqueous alkaline solution containing iodine and an alkali metal ferricyanide complexing agent, with a second aqueous solution of a preformed water dispersible dye colorant selected from the group consisting of diphenylmethane, triphenylmethane, acridine, oxazine, thiazine, diazo, azine, and rhodamine dyes which can be mordanted under aqueous alkaline conditions to a complex formed from said iodide, said silver and said complexing agent.
Dependencies are inferred from the claim text.