Eastman-kodak Company

Fred M Macon

Robert E Dickerson

Steven G Link

Richard B Anderson

Wayne W Weber, Ii

John D Mee

John P Freeman

Dyes of formula (I) below are described. The dyes are useful as mid-green sensitizing dyes for photographic materials ##STR1## In the above formula, R1 and R3 are methyl or ethyl, at least one of R1 and R3 being methyl. R2 and R4 are substituted or unsubstituted C.sub.1 to C.sub.6 alkyl, provided that R2 and R4 are not both methyl. X1, X2, X3, and X4 are each independently methyl, methylthio, fluoro-substituted methyl or methylthio, or hydrogen, provided that at least one of X1 and X2 and at least one of X3 and X4 are not hydrogen. Y represents an ion as needed to balance the charge of the molecule. The dyes of formula (I) sensitize silver halide to light in the mid-green region of the spectrum.

Mid-green sensitizing dyes for photographic materials

A radiographic element is disclosed comprised of a transparent film support and spectrally sensitized tabular grain silver halide emulsion layer units coated on opposite sides of the film support. At least one of the emulsion layer units is comprised of tabular grains having a thickness of less than 0.2 micrometer accounting for greater than 50 percent of total grain projected area and exhibiting an average tabularity of greater than 25. Adsorbed to the surface of the tabular grains is at least one benzimidazolocarbocyanine dye chosen for its high level of absorption in the mid-green spectral region at the emission line of gadolinium oxysulfide, terbium activated intensifying screens and its low residual stain in the fully processed film.

Tabular grain emulsion containing radiographic elements exhibiting

Radiation sensitive silver halide photographic elements are disclosed which are protected from fog by hydrolyzed quaternized chalcogenazolium salts of middle chalcogens, wherein the quaternizing substituent contains a ##STR1## group in which T and T.sup.1 are carbonyl or sulfonyl and m is from 1 to 3.

Growing community of inventors

Rochester, NY, United States of America

Fred M Macon