| 摘要 |
<p>PROBLEM TO BE SOLVED: To instantaneously decide a truth or falsehood without using special equipment by providing an area for repelling an ink and an area free from repelling the ink, in the case of solidly coating a product to be printed by using a water repellent and/or oil repellent ink having simultaneously water repellent and oil repellent functions or solely the water repellent or oil repellent function by an oily or aqueous felt pen. SOLUTION: When an area B to become a design or the like is printed with a water repellent or oil repellent printing ink on a surface of a sheet-like support A having no water repellency or oil repellency and the overall surface is solidly coated with the part by a colored oily and/or aqueous pen different from the surface of the support A after drying, a printed area B of the water repellent or oil repellent ink repels the ink of oily and/or aqueous pen, and hence the area B of the water repellent and/or oil repellent ink does no change, but since a non-printed part of the surface of the support A receives the ink of the oily and/or aqueous pen to be solidly coated, and the area of the surface or the support A and the area B exhibit different colors as ink color parts Y of the oily and/or aqueous pen.</p> |
