Doped fine grain silver halide grains as a means of incorporating metal dopant in emulsion finishing
AssigneeEastman Kodak Company
InventorsPaul T. Hahm, Walter H. Isaac
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Abstract
The invention is directed to a method of forming a sensitized high chloride silver halide emulsion comprising providing a high chloride emulsion bringing a Lippmann emulsion comprising fine grains of silver bromide doped with metal into contact with said emulsion at a temperature of above 50.degree. C. wherein said metal is present in an amount between 0.001 and 0.25 mg/silver mole, said bromide is present in an amount between 0.05 and 3.0 mole percent bromide and the relationship of bromide and metal dopant is M percent Br=Xe.sup.-(Y.multidot.Mt), X=1.36.+-.0.65, Y=10.+-.5, Mt=metal.
Claims15
A method of forming a sensitized high chloride content silver halide emulsion comprising providing a high chloride content emulsion, bringing a Lippmann emulsion comprising fine grains of silver bromide doped with metal into contact with said high chloride emulsion at a temperature of above 50.degree. C. wherein said metal is present in an amount between 0.001 and 0.25 mg/silver mole, said bromide is present in an amount between 0.05 and 3.0 mole percent bromide with respect to silver and the relationship of bromide and metal is
- Mole percent Br=Xe.sup.-(Y.multidot.Mt),
- X=1.36.+-.0.65,
- Y=10.+-.5,
- Mt=metal in milligrams per silver mole.
Dependencies are inferred from the claim text.