Patent ID: 7083906

Claim:
A heat-developable photosensitive material having on a support at least one light-sensitive layer comprising an organic silver salt, a light-sensitive silver halide and a reducing agent and at least one light-insensitive layer, which comprises an antihalation dye represented by formula (I) or formula (II): wherein in formula (I), Z 1 and Z 2 each independently represents a nonmetallic atomic group for forming a 5- or 6-membered nitrogen-containing heterocyclic rings R 1 and R 2 each independently represents an alkyl group, an alkenyl group, and aralkyl group or an aryl group, L 1 represents a methine chain having 3 or 5 methine groups, a, b, and c each independently represents 0 or 1, provided that c is 0 when the antihalation dye of formula (I) has an anionic substituent such as a sulfo or carboxyl group and forms an inner salt, and X represents an anion, wherein in formula (II), Y 1 and Y 2 each independently represents nonmetallic atoms forming an aliphatic or heterocyclic ring, L 3 represents a methine chain having 3 or 5 methine groups, and Xa represents a proton or a cation, and wherein the antihalation dye causing no decoloration by heat is a dye aggregate and the antihalation dye has a maximum absorption wavelength of transmission absorption spectra between 600 nm and 750 nm, has an absorbance peak whose half width is 100 nm or below in its transmission absorption spectrum, and provides a tone represented by inequalities 92<L*≧85 324≧(a*) 2 +(b*) 2 16, 0≧a* and 0≧b* on the CIELAB space in a background after heat development, as determined using a standard light source D50 for colorimetry.