| 摘要 |
PROBLEM TO BE SOLVED: To provide a concealed postcard, in which concealed information can be visually recognized not immediately after the releasing of overlapping surfaces. SOLUTION: This concealed postcard consists of two sheets of paper strips 2 and 3, which are releasably bonded together through a pressure sensitive adhesive 12 bondable at least under a certain pressure and releasable after bonding and on the overlapping surface of which concealed information 5, which is not desired to be seen by others, is displayed under the condition that the concealed information 5 is covered with a scratching ink layer 6 and the bonding with the pressure sensitive adhesive 12 is performed by folding up the overlapping surface with a folding perforation 4 and then applying a predetermined pressure to the surface. COPYRIGHT: (C)2004,JPO
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