Yellow color formers for use in color photothermographic system

Claim 1

A photographic construction comprising at least one polymeric binder layer containing spectrally-sensitized photographic silver halide and, in association therewith a. a non-light sensitive organic silver salt oxidizing agent, b. at least one biphenol color-forming reducing agent having the formula ##STR11## wherein each R is independently selected from a straight chain or branched alkyl or alkoxy group having 1 to 6 carbon atoms, and phenyl, and R 1 is hydrogen or an alkali-labile protecting group, and c. at least one aliphatic or aromatic carboxylic acid as development modifier, the acid having the formula R(COOH).sub.x wherein x is an integer having the value 1 or 2, R is a group which is unsubstituted or substituted by at least one group selected from amino, hydroxyl, lower alkyl (C 1 to C 4 ), nitro, and one or two chloro atoms, wherein when x is 1, R is selected from the group consisting of alkenyl, aryl, and phenylalkyl, having up to 10 carbon atoms, and when x is 2, R is selected from the group consisting of alkenylene, alkylene, and arylene, having up to 14 carbon atoms; and d. optionally, at least one toner; said polymeric binder layer being capable of providing a yellow to gold color upon development.