HIDING PRINTED MATTER AND METHOD FOR PRINTING HIDING PRINTED MATTER
PROBLEM TO BE SOLVED: To provide a hiding printed matter capable of easily confirming hiding contents, and capable of repeated use since hiding contents are reversibly disappeared, and a method for printing a hiding printed matter.SOLUTION: Provided is a hiding printed matter having a hydrophilic ba...
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Format: | Patent |
Sprache: | eng ; jpn |
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