| 摘要 |
The paper is identified the original from the forged one by projecting latent image when copying. On the surface of the paper, there are dotted line of 0.04-0.06mm width and 0.40-0.07mm length by 0.20-0.27mm interval or solid line of 0.04 or 0.06mm width by 0.3 or 0.37 interval, and dazzlement pattern of 0.1-0.27mm width. As a background, the latent images are arranged at the angle of 90deg., 60deg., 45deg. and 30deg., to the horizon. So the directions of lines or dotted lines correspond with the directions of scanning line of a copying machine.
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