摘要:
Photographic silver halide emulsions show increased speed and reduced latent image fading when a compound of the following structure is incorporated: ##STR1## wherein: X is ##STR2## Y.sup.1 and Y.sup.2 individually represent hydrogen or an aromatic nucleus or together represent the atoms completing a fused aromatic nucleus;Z is ##STR3## R is hydrogen or lower alkyl of from 1 to 5 carbon atoms; and R.sup.1 is hydrogen or methyl.
摘要:
Photographic silver halide emulsions show increased speed and reduced latent image fading when a compound of the following structure is incorporated: ##STR1## wherein: X is --O--, --S--, --Se--, or ##STR2## Y represents the atoms completing a fused aromatic nucleus; Z is ##STR3## and R is hydrogen or lower alkyl of from 1 to 5 carbon atoms.
摘要:
Photographic silver halide emulsions show increased speed and reduced latent image fading when a compound of the following structure is incorporated: ##STR1## wherein: X is -O-, -S-, -Se-, or ##STR2## Y represents the atoms completing a fused aromatic nucleus; Z is ##STR3## R is hydrogen or lower alkyl of from 1 to 5 carbon atoms.
摘要:
Radiation-sensitive silver halide photographic elements are disclosed which are protected against fog by cyclic dichalcogenides. A new cyclic oxaspiro ditelluride is disclosed.
摘要:
Photographic silver halide emulsions show increased speed and reduced latent image fading when a compound of the following structure is incorporated: ##STR1## wherein: X is --O--, --S--, --Se--, or ##STR2## Y.sup.1 and Y.sup.2 individually represent hydrogen or an aromatic nucleus or together represent the atoms completing a fused aromatic nucleus;Z is ##STR3## R is hydrogen or lower alkyl of from 1 to 5 carbon atoms; and R.sup.1 is hydrogen or methyl.
摘要:
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.
摘要:
A radiation-sensitive composition including silver halide grains capable of forming an internal latent image and a nucleating agent is useful as a coating on a support to form a photographic element.