| 摘要 |
PROBLEM TO BE SOLVED: To provide a concealed postcard having three sheet pieces in which concealing information cannot be visually recognized even when the postcard is looked through in the light. SOLUTION: The concealed postcard 17 is made by releasably adhering the three sheet pieces 2, 3 and 4 and covering to conceal the concealing information displayed on a superposed surface and undesired to be known by a thirdparty. Camouflaged prints 15, 14 and 16 of one color selected from the group consisting of cyan, magenta and yellow colors are respectively performed on a superposed surface of the upper sheet piece 2, a superposed surface of the intermediate sheet piece 3 and a front surface of the lower sheet piece 4 by solid printing or ground pattern printing. When the three pieces 2, 3 and 4 are superposed, the three color camouflaged prints 15, 14 and 16 are constituted to be vertically corresponded to each other. Thus, the respective colors are clearly identified from normal black ink for printing the concealing information, while its opacity can be enhanced by the fact that the three colors are superposed to become blackish. COPYRIGHT: (C)2004,JPO
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