| 摘要 |
PURPOSE:To attain to prevent an improper use by the dupulication of printed matter, by entirely or partially applying a coating agent or printing ink containing metal powdery pigment to a surface to be printed by coating or printing prior to performing printing, simultaneously with printing or after printing. CONSTITUTION:A coating agent or printing ink containing metal powdery pigment, metal flaky pigment or meal deposition powdery pigment is entirely or partially applied to a surface to be printed by coating or printing prior to performing the printing of a character or image, simultaneously with the printing or after the printing to prepare printed matter showing no duplication reproducibility. Because the aforementioned pigment such as the metal powdery pigment is scaly or flaky, it has a property totally reflecting incident light and reflects light emitted from the light source of an electrophotographic copier when present on the coating or printing surface in a sufficient amount and erases the charge of a photosensitive drum. |
