| 摘要 |
An alteration-sensitive imprinted article made of a durable, flexible plastic sheet material has two opposing surfaces, at least one of which is capable of retaining an ink coating. A positive design is directly applied to at least a designated area of said one surface of the sheet, and at least a translucent, non-erasable film or coating or sheet composed of plastic material is bonded to and applied over at least said designated area of said one surface. The film or sheet has on the side thereof opposed to that bonded to said one surface a negative design which is exactly matched to the positive design so that the two designs comprise a blanket or continuous covering over the designated area. An erasable ink coating applied over the translucent, non-erasable film or coating or sheet covers at least the designated area of said one surface. Recorded information is applied over the erasable ink coating, and the blanket covering has a generally contrasting appearance to the erasable coating, so that an attempt to erase the recorded information will simultaneously cause an erasure of the erasable coating thereby revealing the covering formed by said negative and positive designs and its contrasting appearance.
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