Patent ID: 7163782

Claim:
A photothermographic imaging material comprising a organic silver salt, a silver halide, a binder, a reducing agent, a cyan leuco dye, and a yellow coloring leuco dye represented by the following Formula (YA); and wherein the R 11 represents a substituted or unsubstituted alkyl group, the R 12 represents hydrogen atom or substituted or unsubstituted alkyl or acylamino groups, the R 11 and the R 12 are not 2-hydroxyphenylmethyl group, the R 13 represents hydrogen atom or substituted or unsubstituted alkyl group, and the R 14 represents a group capable of being substituent on a benzene ring; and wherein the reducing agent comprises a compound represented by the following Formula (1); and wherein the X 1 represents chalcogen atom or —CHR 1 , the R 1 represents hydrogen, halogen, alkyl group, alkenyl group, aryl group or heterocyclic group, and the R 2 represents alkyl group, the two R 2 s can be either same or different, and at least one of them is secondary or tertiary alkyl group, the R 3 represents hydrogen atom or a group which can be a substituent on a benzene ring, the R 4 represents a group which can be a substituent on a benzene ring, the m and the n represent integer of 0 to 2 respectively.