Abstract: The invention relates to novel thermographic recording compositions. Novel color developers for thermographic compositions consist of the compounds of the formula: ##STR1## The invention is useful for recording supports for data generally, for example, computers, medical, etc.

Abstract: The present invention relates to thermographic record compositions and to novel color developers for thermographic compositions consisting of:the compounds of formula: ##STR1## in which R represents: H, alkyl, NO.sub.2, halogen, aryl, NH.sub.2, OH, COOH, HSO.sub.3, NR.sub.1 R.sub.2, COOR.sub.3, OR.sub.4 (R.sub.1, R.sub.2, R.sub.3, R.sub.4 =alkyl or aryl), X represents H or a group possessing a labile H capable of forming a stable anion by loss of a proton H.sup.+,or their salts of formula, when X=H: ##STR2## in which R and n are as defined hereinabove and M.sup.+ represents a metal cation. The invention is more particularly applicable to supports for recording data.