PURPOSE: To obtain a desensitizer capable of erasing and changing a heat-sensitized color to the color of a pigment immediately after being coated by mixing a desensitizing substance with a specific solvent.

CONSTITUTION: A liquid desensitizer is obtained by mixing at least 1W50wt% a desensitizing substance (A)[e.g., ethylene glycol, diethylene glycol(monomethylether), etc.], having a desensitizing effect on a heat-sensitive recording, with at least one of heat-sensitive color-forming agents (B) consisting of leuco dye and developer and a solvent (e.g., methanol, acetone, etc.) capable of dissolving at least one of the leuco dye and developer.