| 摘要 |
PURPOSE: To form a record which resists to photographing copying and has a contrast good to the human eyes by forming the front surface of the photographic copying resistant part of the record 1 by a layer contg. at least one kind of materials which are visible in varied colors depending upon angles and the adjacent zones of layers of dark colors. CONSTITUTION: The single layer 2 contg. at least one kind of materials which are visible in the varied colors depending upon the angles is deposited on a white or colored sheet 1. The dark color layer 3 is then deposited on the coated sheet in the form of desired information by, for example, hand writing or photographic copying. In the case of the latter, the sheet is introduced into a copying machine in place of ordinary white paper. The offsetting on the sheet 1 is possible as well. However, the photographing copying afford black copy without the information and, therefore, the given record is noncopiable. Namely, the prepared record is a noncopiable part. |
