| 摘要 |
<p>PURPOSE:To visually easily identify a forgery of a sheet such as a gift certificate, a stock certificate, etc., by copying. CONSTITUTION:An underline 6 printed partly on a gift certificate is formed of a line part 6a and a character part 6b, a thickness of the part 6a is matched to a size of each character of the part 6b to be recognized as one line by normal visual recognition, and a density of a color of the part 6a is reduced to be matched to that of the part 6b. In the case of genuine gift certificate, when the underline 6 is observed by a simple microscope, the characters of the part 6b can be visually recognized, but if it is copied, the characters cannot be reproduced, and hence the underline after copying can be recognized as one line even if it is observed by the microscope, and can be identified as a forgery. Since the densities of the parts 6a, 6b are matched, no sense of incongruity occurs as one line.</p> |
