| 摘要 |
PROBLEM TO BE SOLVED: To provide a color changeable ink composition irreversibly erasable by heating to about 40 to about 120°C which does not start to change in color up to a specific temperature (particularly about 55°C).SOLUTION: The color changeable ink composition forms colored particles by mixing a group of an electron-donating color developable organic compound and an electron-accepting compound with an aromatic compound having a melting point of 40-120°C to maintain a color developed state by separating the electron-donating organic compound having color-developed by the electron accepting compound from a color erasing agent and liquefies the aromatic compound by heating to allow the color erasing agent to act on the electron-accepting agent to render the electron-donating color developable organic compound in a color erased state. |
