Eastman-kodak Company

Gladys L MacIntyre

Roger L Lok

Richard L Parton

Eric L Bell

Wayne W Weber, Ii

Dorothy J Beavers

The present invention provides a photographic emulsion comprising a silver halide grains containing at least two dopants. The dopants comprise an osmium-based transition metal complex containing a nitrosyl or thionitrosyl ligand, and a transition metal complex containing a transition metal selected from Group 8 of the periodic table.

Photographic silver halide emulsion containing contrast improving dopants

The present invention provides a photographic element comprising a support having thereon a silver halide emulsion layer. The emulsion layer contains an organic compound having a thiosulfonic acid substituent, an organic compound having a sulfinic acid substituent, and an amine borane.

Photographic element exhibiting improved speed and stability

The invention is generally accomplished by providing a halide emulsion comprising radiation sensitive silver halide doped with a combination of iridium and transition metal complex with a nitrosyl ligand. The method of doping comprises one in which the transition metal complex with a nitrosyl ligand is generally evenly distributed throughout the grain and the iridium is present in about the outer 10 percent, by volume, of said grain. In a preferred form, the transition metal complex with a nitrosyl ligand is present in an amount between about 0.03 and about 36 molar parts per billion, and the iridium is present in an amount of between about 10 and about 350 molar parts per billion.

Transition metal complex with nitrosyl ligand dopant and iridium dopant

Sensitizing dyes for photographic materials are disclosed. The dyes have the formula: ##STR1## Z.sub.1 represents the atoms necessary to complete a benzoxazole nucleus, a benzothiazole nucleus, a benzoselenazole nucleus, a benzotellurazole nucleus, or a benzimidazole nucleus, which, in addition to being substituted by R.sub.3, may be further substituted or unsubstituted,

Sensitizing dye for photographic materials

The raw stock keeping quality of photographic recording material is improved without loss of photographic speed. The improved keeping quality results from a combination of agents which cause speed losses when separately employed.

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Clyde, NY, United States of America

Gladys L MacIntyre