Photothermographic accelerators for leuco diazine, oxazine, and thiazine dyes

摘要

A photothermographic construction comprises a light-sensitive color- forming element on a support base, the element comprising a silver source, optionally silver halide, a binder, and an oxidizable leuco phenazine, phenoxazine, or phenothiazine dye, and as development accelerator a carboxylic acid, Lewis acid, or Bronsted acid.