| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent forgery made by a color copying machine positively by facilitating discrimination and recognition between a genuine item and a spurious item for the user of valuable securities and the like. SOLUTION: The color copy prevention printed matter 1 is formed of a checking latent image part 10 consisting of characters or the like and a nonlatent image part 20 being the same in its cold, and any one of both the parts thereof 10, 20 being painted out or grained by reversible thermochromic ink that can discolor and decolor at approximate 30 deg.C and the other consisting of the size of dotted points A or the thickness of lines that can be copied by ordinary printing ink.</p> |
