| 摘要 |
PROBLEM TO BE SOLVED: To provide a reversible thermochromic printed matter which allows a clear black color to be visually recognized, and discolors to a clear color other than a black color when discoloring.SOLUTION: A reversible thermochromic printed matter 1 comprises a reversible thermochromic layer 3 provided on a support 2, and a reversible thermochromic layer 4 provided on the reversible thermochromic layer 3. The reversible thermochromic layer 3 includes a non-allochroic colored pigment having a luminous reflectance Y of 20% or more, and a reversible thermochromic pigment which changes from black to colorless or a reversible thermochromic pigment which changes from a color being complementary color to a non-allochroic colored pigment color to colorless, and the reversible thermochromic layer 3 changes from a color visually recognizable as black or nearly black to a color exhibited by the non-allochroic colored pigment. The reversible thermochromic layer 4 includes a reversible thermochromic pigment changing from black to colorless, and changes from black to colorless. In the reversible thermochromic printed matter 1, the difference between a luminance reflectance when the reversible thermochromic pigment of the reversible thermochromic layer 3 is in a colored state and a luminance reflectance when the respective reversible thermochromic pigments of the reversible thermochromic layer 3 and of the reversible thermochromic layer 4 are in a colored state is 1.5% or more. |
