High contrast photographic emulsions containing a phenyl...

Details High contrast photographic emulsions containing a phenyl... High contrast photographic emulsions containing a phenyl...

G - Physics

03

C

96/100, 96/61

G03C 1/34 (2006.01)

Patent

CA 1146001

-0- HIGH CONTRAST PHOTOGRAPHIC EMULSIONS AND ELEMENTS AND PROCESSES FOR THEIR DEVELOPMENT Abstract of the Disclosure This invention relates to a photographic element comprising a support, and coated on the support at least one negative-working photographic emulsion comprising radiation-sensitive silver halide grains capable of form- ing a surface latent image and a binder, and in the support or in a remaining hydrophilic colloid layer coated on the support in an amount sufficient to increase contrast, a hydrazine compound of the formula Image wherein R1 is a phenyl nucleus having a Hammet sigma value-derived electron withdrawing characteristic of less than +0.30.

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