Photographic emulsions containing internally and externally modified silver halide grains
AssigneeEastman Kodak Company
InventorEric L. Bell
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Abstract
The present invention provides a photographic emulsion comprising silver halide grains, a dopant, and a grain surface modifier. The dopant is a transition metal complex comprising a nitrosyl or thionitrosyl ligand with a transition metal selected from the group consisting of ruthenium and osmium. The grain surface modifier is a transition metal selected from Group VIII of the periodic table.
Claims20
A photographic silver halide emulsion comprising silver halide grains, a dopant, and a grain surface modifier;
- wherein said dopant is a transition metal complex comprising a nitrosyl or thionitrosyl ligand with a transition metal selected from the group consisting of ruthenium or osmium;
- and wherein said grain surface modifier is a transition metal complex containing a transition metal selected from Group VIII of the periodic table, and is positioned at intervals along the surface of said silver halide grains in a Silver bromide carrier, said silver bromide carrier accounting for less than about 2 molar percent of said silver halide grains.
A photographic silver halide emulsion having silver halide grains formed in the presence of a dopant, said dopant being a transition metal complex and comprising a nitrosyl or thionitrosyl ligand with a transition metal selected from the group consisting of ruthenium and osmium;
- and modified subsequent to their formation by a grain surface modifier, said modifier being a Group VIII transition metal with a cyanide ligand.
Dependencies are inferred from the claim text.