| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a label for performing discount sale according to freshness of commodities.SOLUTION: The label comprises: a medium for carrying an image; an image part which is formed by first color, and whose color changes to second color different from the first color after detecting reduction of freshness of the commodity; and a background part whose color is the first or second color. The image part is formed by an ink including a rot detection dye which is selected at least one or more kinds from a dye group of anthocyanin dye, cochineal dye, lac color, quinone dye, curcuma dye, carotenoid dye, flavonoid dye, and porphyrin dye.</p> |
