A thermosensitive reversible color-developing and disappearing agent includes an aromatic compound having at least one group of the formula, --SO.sub.2 NHCXNH--, wherein X.dbd.O or S atom, and at least one straight chain alkyl group with 11 or more carbon atoms, and is reactive with a dye precursor in a thermosensitive recording material to thereby record colored images on the recording material upon heating imagewise, and make the colored images disappear upon heating to a temperature lower than the colored image-forming temperature.
一种热敏可逆的颜色显现和消失剂,包括至少具有一个式子--SO.sub.2NHCXNH--的芳香化合物,其中X为O或S原子,并且具有至少一个直链烷基,该烷基含有11个或更多碳原子,并且与热敏记录材料中的
染料前体反应,从而在加热成像的过程中在记录材料上记录有色图像,并在加热至低于形成有色图像的温度时使有色图像消失。