| 摘要 |
PURPOSE:To ensure secret characteristics to a used ink ribbon by providing a hot-melt ink layer and a heat-resistant layer having the same color as the ink layer or colored black on a support or providing a thermal transfer ink layer and an undercoat layer having the same color as the ink layer or colored black on the support or coloring the support so as to have the same color as the hot-melt ink layer or a black color. CONSTITUTION:At least either one of ink ribbons 5a, 5b must be colored excepting an ink layer 52 so as to have the same color as the ink layer 52 or a black color. By this method, though the ink layer is removed from the ink ribbon 5a or 5b here and there after receiving paper 5c is released after printing, printed content becomes hard to read. For example, even in such a state that the ink ribbon 5b and the receiving paper 5c are yet bonded even after printing, recorded content can be partially read. However, it is difficult that a third person grasps recorded content from the ink ribbon 5b individually having developed color parts remaining after the receiving paper 5c is separated. |
