A thermally reversible color forming composition which includes an electron-donating chromophoric compound and an electron-accepting compound, by which formation and deletion of a color image may be carried out by adjusting thermal energy applied to the composition, wherein the electron-accepting compound is a carboxylic acid compound having the following general formula (1):R1-X-R2-COOH(1)in which, X represents a divalent group having at least one hetero atom, R1 represents a hydrocarbon group having at least one hetero atom, R2 represents an aliphatic hydrocarbon group, which may be substituted and whose principle chain contains less than 6 carbon atoms.
Thermally reversible color forming composition and thermally reversible recording medium using the thermally reversible color forming composition