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    • 1. 发明专利
    • PRINTED PRODUCT
    • JP2001042772A
    • 2001-02-16
    • JP22104999
    • 1999-08-04
    • DAINIPPON PRINTING CO LTD
    • UBUKAWA HIROAKITOMIZAWA KENJIITO HIDEO
    • G09F3/02
    • PROBLEM TO BE SOLVED: To unnecessitate overlapping of a transparent sheet or the like and to prevent the function as a book from being damaged during use by using a masking seal which becomes transparent so that a masked part is visible only when touched by hand in combination with a printed matter. SOLUTION: In the masking seal S, a releasing paper 3 is stuck to the rear surface of a transparent sheet 1 via an adhesive agent and a temperature- sensitive ink 4 is printed on the surface of the transparent sheet 1 to form a masking region. When a learning teaching material is used, the releasing paper 3 is peeled from the masking seal S to expose the adhesive agent and the masking seal S is stuck on a masking part in a Japanese history reference book 10, for instance, as a year number and a personal name. When pressing by a finger is applied on the masking seal S, the temperature-sensitive ink 4 becomes transparent because of body temperature to make information at the masking part visible and the year number, the personal name or the like can be confirmed. A place where the masking seal S is stuck is optional and accordingly an original reference book can be produced.