Photosensitive compositions

A printout composition for providing printout faculty comprising the 2-trihalomethyl-5-aryl-1,3,4-oxadiazole compound represented by the following general formula and a discoloring agent, said discoloring agent being an arylamine inherently colorless but being colored upon reaction with the photodecomposition product of the compound of the formula, or said discoloring agent being originally colored but is discolored upon reaction with said photodecomposition product and being selected from the group consisting of a diphenylmethane series dye, a triphenylmethane series dye, a thiazine series dye, an oxazine series dye, a xanthene series dye, an anthraquinone series dye, an imino naphtholquinone series dye, and an azomethine series dye:

• ##STR11## wherein X represents a chlorine atom or a bromine atom and A represents a phenyl group, a naphthyl group or a phenyl or naphthyl group substituted by a halogen atom, an unsubstituted alkyl group, an alkoxy group, a nitro group, a cyano group or a methylenedioxy group.