Heat development image forming process, thermally decoloring image recording process and process for decoloring cyanine dye

摘要

A heat developable light-sensitive material comprises a support, a light-sensitive layer and a non-light-sensitive layer. The light-sensitive layer contains silver halide and a reducing agent. The non-light-sensitive layer contains a cyanine dye represented by the formula (I) or a salt thereof and a base precursor: in which R<1> is hydrogen, an aliphatic group, an aromatic group, -NR<21>R<24>, -OR<21> or -SR<21>, each of R<21> and R<24> independently is hydrogen, an aliphatic group or an aromatic group, or R<21> and R<24> are combined to form a nitrogen-containing heterocyclic ring; R<2> is hydrogen, an aliphatic group or an aromatic group; R<3> is an aliphatic group; L<1> is a methine chain consisting of an odd number of methines; and each of Z<1> and Z<2> independently is an atomic group forming a five-membered or six-membered nitrogen-containing heterocyclic ring. A heat development image forming process, a thermal image recording material, a thermally decoloring image recording process and a process for decoloring a cyanine dye are also disclosed.