Photographic element exhibiting reduced sensitizing dye stain
AssigneeEastman Kodak Company
InventorRobert E. Dickerson
Life of this patent
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Abstract
A spectrally sensitized silver halide photographic element capable of producing a stable, viewable silver image on development and fixing out is disclosed. The latent image forming silver halide grains in the image recording emulsion layer or layers of the photographic element are silver bromide, chloride, or chlorobromide grains. At least one of the image recording emulsion layers contains spectrally sensitized tabular grains. Located in proximity to the spectrally sensitized tabular grains are relatively fine high iodide silver halide grains capable of being dissolved during fixing out.
Claims16
In a photographic element capable of producing a stable, viewable silver image on development in an aqueous alkaline processing solution and fixing out comprising
- a support and
- one or more image recording silver halide emulsion layers each comprised of a dispersing medium and latent image forming silver halide grains, said halide consisting essentially of chloride, bromide, or mixtures thereof,
- at least one of said image recording silver halide emulsion layers being comprised of spectral sensitizing dye adsorbed to the surface of tabular latent image forming silver halide grains having a thickness of less than 0.5 .mu.m and an average aspect ratio of at least 5:1 accounting for at least 35 percent of the total projected area of said latent image forming silver halide grains present in said silver halide emulsion layer,
- the improvement comprising high iodide silver halide grains of less than 0.25 .mu.m in mean diameter located in proximity to said tabular silver halide grains and limited to a concentration capable of being dissolved on fixing out.
In a radiographic element capable of producing a stable, viewable silver image on development in an aqueous alkaline processing solution and fixing out comprised of
- first and second image recording silver halide emulsion layers each comprised of a dispersing medium and latent image forming silver bromide grains,
- a film support interposed between said emulsion layers capable of transmitting radiation to which said image recording emulsion layers are responsive,
- at least said first image recording silver halide emulsion layer being a high aspect ratio tabular grain emulsion layer wherein the latent image forming silver bromide grains having a thickness of less than 0.3 .mu.m and a diameter of at least 0.6 .mu.m have an average aspect ratio of greater than 8:1 and account for at least 50 percent of the total projected area of the latent image forming silver bromide grains present in said first emulsion layer,
- said high aspect ratio tabular emulsion layer containing spectral sensitizing dye in an amount sufficient to form a monolayer coverage of from 25 to 100 percent of the total available surface area of said tabular silver bromide grains,
- the improvement comprising high iodide silver halide grains of from 0.25 .mu.m to 0.01 .mu.m in mean diameter located in proximity to said tabular silver bromide grains of said first emulsion layer in a concentration of less than 3 mole percent, based on total halide present in said first emulsion layer.
Dependencies are inferred from the claim text.