Eastman-kodak Company

Robert E Atwell

Francis J Evans

This disclosure relates to high chloride silver halide emulsions and photographic elements containing silver halide grains which are internally doped with cadmium, lead, zinc or mixtures thereof in concentrations up to 7.times.10.sup.-5 mole/mole of silver halide.

Internally doped surface sensitized high chloride silver halide

A photographic silver halide emulsion capable of forming on exposure an internal latent image can be formed having a desired characteristic curve by providing a first photographic silver halide emulsion comprised of silver halide grains internally sensitized with a combination of middle chalcogen and noble metal sensitizers capable of forming on exposure an internal latent image and blending therewith a second, higher contrast photographic silver halide emulsion comprised of silver halide grains internally sensitized with a relatively lower proportion of middle chalcogen to noble metal sensitization. Both the first and second photographic silver halide emulsions are sensitized with the same middle chalcogen and noble metal sensitizers.

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Spencerport, NY, United States of America

Robert E Atwell