| abstract |
A thermosensitive reversible color-developing and disappearing agent includes an aromatic compound having at least one group of the formula, -SO₂NHCXNH-, wherein X = 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. |