Black and white photothermographic material and image forming method

A black and white photothermographic material comprising at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent represented by the following formula (1), a coupler which reacts with an oxidation product of the reducing agent to form a dye, and at least one development accelerator represented by the following formula (A-1) or formula (A-2) on a support:

• wherein R1, R2, R3, and R4 each independently represent a hydrogen atom or a substituent which substitutes for a hydrogen atom on a benzene ring;
• and R5 represents one selected from an alkyl group, an aryl group, or a heterocyclic group;
• Q-NHNH-Q2 Formula (A-1)
• wherein Q1 represents an aromatic group or a heterocyclic group which bonds to —NHNH-Q2 at a carbon atom;
• and Q2 represents one selected from a carbamoyl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfonyl group, or a sulfamoyl group;
• wherein R11 represents one selected from an alkyl group, an acyl group, an acylamino group, a sulfonamido group, an alkoxycarbonyl group, or a carbamoyl group;
• R12 represents one selected from a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an acyloxy group, or a carbonate ester group;
• R13 and R14 each independently represent a group substituting for a hydrogen atom on a benzene ring;
• and R13 and R14 may link together to form a condensed ring.