| 摘要 |
PROBLEM TO BE SOLVED: To provide techniques for preventing breakage of a recording medium caused by peeling a concealment sticker from the recording medium and for easily managing the recording medium from which information has been read out completely. SOLUTION: The concealment sticker 10 comprises a light-transmitting substrate 11, a light-shielding layer 12 supported by the substrate 11, and a light-transmitting adhesive layer 13 formed on the light-shielding layer 12, wherein the light-shielding layer 12 exhibits reversibility of varying from light-shielding property to light-transmitting property with temperature increase and from light-transmitting property to light-shielding property with temperature decrease. COPYRIGHT: (C)2008,JPO&INPIT
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