| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a duplication-proof article which has a duplication-proof function to make its duplication impossible by means of a color duplicating machine and can be manufactured at a low cost. SOLUTION: This duplication-proof article has a duplication-proof part containing a metallic oxide-coated silica flake pigment displaying a varied color effect depending upon a visual angle or a viewing position.</p> |
