Abstract:
A thermal-dye-bleach construction comprising a dye in association with a thermal dye-bleaching agent of general formula I: ##STR1## wherein: each of R. sup. a and R. sup. b are individually selected from: hydrogen, an alkyl group, an alkenyl group, a cycloalkyl group, an aralkyl group, an aryl group, and a heterocyclic group, and preferably, both R. sup. a and R. sup. b represent hydrogen; p is one or two, and when p is one, Z is a monovalent group selected from: an akyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an aryl group, and a heterocyclic group, and when p is two, Z is a divalent group selected from: an alkylene group, an arylene group, an alkenylene group, an alkynylene group, an aralkylene group, a cycloalkene group, and a heterocyclic group; and, M. sup. + is a cation which will not react with a carbanion generated from the thermal-carbanion-generating agent in such manner as to render the carbanion ineffective as a bleaching agent for the dye.