| 摘要 |
PROBLEM TO BE SOLVED: To reduce consumption amount of a sheet and to help save resources by displaying date information of each month of the calendar by sheets of a half of the sheets used for a conventional calendar. SOLUTION: The calendar displays date information 3a of each month on a surface of a base material 2. In this case, a masking layer 4 using a heat- sensitive achromizing ink is formed on a region displayed with the information 3a of each month, and date information 5a of the month before the previous month of the information 3a displayed on the surface of the material 2 is displayed by a heat-sensitive achromizing ink 5 of the color different from that of the layer 4 on the layer 4.
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