| 摘要 |
PROBLEM TO BE SOLVED: To obtain an offset printed product capable of preventing a forgery by a copy capable of identifying the copy from the product by obtaining a good sense of gloss and losing the sense of gloss when copied. SOLUTION: Roughness of a paper texture is eliminated on a surface of a sheet 1 of woodfree paper or the like by pressure working such as embossing to form a smooth surface 2. On the smooth surface 2, a predetermined pattern is offset printed with an offset ink made of a pearl ink having a pearl pigment or a metallic ink having a metal powder of a content and a particle size capable of assuring flowability in a printer to obtain an offset printed product having a sense of gloss by projecting the particles 3 from the surface without embedding in a vehicle 4, but when the offset printed product is copied, the sense of gloss due to the offset ink is lost.
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