| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sheet applied in which an anti-forgery countermeasure is taken such that a securities made of a paper based material faithfully and indistinguishably from an original one by means of a color copy, a printer or a DTP can be distinguished from the original one. SOLUTION: A thermal coloring layer principally comprising a colorless or light color coloring substance, a substance for thermally developing a color from the coloring substance and a polymer binder is provided on a basic material made of a paper or a film. A thermal recording medium 3 is then provided thereon in the form of slits of 1-5 mm wide while being exposed partially at least on one side of the basic material.</p> |
