Method for formation of an image comprising a heating step

Abstract

A novel method for formation of an image comprising a heating step, comprising the heating carried out in the presence of a compound of general formula (I): X--SO.sub.2 (DI) (I) wherein X represents a reducing group capable of reducing a silver salt and capable of being oxidized by heating and in its oxidized state capable of releasing a compound represented by (DI)--SO.sub.2 NH.sub.2 by reaction with a nucleophilic agent; and (DI) represents a development inhibiting group capable of inhibiting the oxidation reduction reaction of the silver salt and a reducing aent. The compound of the formula (I) functions to inhibit development after a certain period of time from the beginning of heat development. The present method provides a stable image with reduced fog and image mottle.

Dependencies are inferred from the claim text.