| 摘要 |
<p>PURPOSE:To provide a new recording medium of high security in which an information to distinguish false from truth which can not be discriminated visually, can be read only by using a proper means to prevent forgery for every individual information recording medium is retained. CONSTITUTION:An information recording medium is constituted of a magnetic layer, a heat degradation printing layer 3 composed of a thin metal film, an electron acceptable compound and a heat sensitive color developing layer 4 containing an electron donative compound developing color by the reaction with an electron accepting compound laminated successively on a substrate 1. An infrared ray absorbent is contained in the magnetic layer, and absorption is not carried out substantially before and after coloring in an infrared ray region by the electron donative compound of the heat sensitive color developing layer 4.</p> |
