| 摘要 |
PURPOSE:To obtain the clear high temperature coloring picture of a high coloring density and besides, to achieve the improvement of the shelf life in terms of heat resistance, humidity resistance, etc., by using a specific compound as the developer for a high temperature coloring layer. CONSTITUTION:A high temperature coloring layer, a decoloring layer, and a low temperature coloring layer are laminated in that order on a base material. Then, the compound A expressed by a formula 1 and the compound B expressed by a formula II or a formula III are used as the developer of the high temperature coloring layer. When the compound expressed by this formula 1 is used as the developer of the high temperature coloring layer, the coloration due to texture fogging, finger marks, etc. in the storage for a long time does not occur. Further, when the compound expressed by the formula II or III is contained as the developer, a sufficient clear picture can be obtained by preventing decoloring agent from acting the high temperature coloring layer when a two-color picture is formed. In the formula, Z represents -S- or the like and R1-R6 represent H or the alkyl group of 1-4 in carbon number. |
