SHEET HAVING AT LEAST ONE WATERMARK OR PSEUDO WATERMARK, THE SHEET HAVING WATERMARK OR PSEUDO WATERMARK OBSERVABLE ONLY FROM ONE SURFACE THEREOF

摘要

PROBLEM TO BE SOLVED: To propose new security measures against falsification of security documents and sheets, the security measures easily observable by a person on a street while exhibiting a sufficient level of security.SOLUTION: A sheet 1 comprises: a front face and a rear face; a first layer 2 including at least one first watermark or pseudo watermark 4 and 5; a second layer 3; and at least one middle layer 6 between the first and the second layers 2 and 3. The middle layer 6 diffusing light and having translucency includes a cavity and/or a diffusion filler selected from an inorganic pigment and an organic pigment and/or surface unevenness. This allows a user to observe at least one portion of the watermark or pseudo watermark 4 and 5 with transmitted light and in a position of the middle layer 6, only from one surface of the sheet 1.