| 摘要 |
PROBLEM TO BE SOLVED: To develop a color of adzuki bean or a wine red by specifying color difference value a* and value b* of a color-developing image, which are specified in JIS-Z-8729. SOLUTION: A color difference value a* is a parameter to represent a green tone, and shows that the green tone becomes stronger a becoming large in minus, and the green tone becomes weaker as approaching zero, and a red tone becomes stronger as becoming larger in plus. Also, a color difference b* is a parameter to represent a blue tone, and shows that the blue tone becomes stronger as becoming larger in minus, and the blue tone becomes weaker as approaching zero, and a yellow tone becomes stronger as becoming larger in plus. This thermal recording body, the color difference value a* of a color developing image is 0-50, and the value b* is -15-10, and a required tone of adzuki bean color or a wine red color can be obtained. In addition, the color difference value a* is preferably set at 10-50, and the value b* is set at -15-0 to obtain a clearer tone, and more preferably, the color difference value a* is in a range of 15-45, and the value b* is in a range of -10-0. |
