| 摘要 |
<p>PURPOSE:To effectively prevent forgery of color copying by immediately identifying presence or absence of a copy using a color copying machine. CONSTITUTION:A printed matter, needing prevention of a forgery by copying using a color copying machine, comprises color copy preventing means having a daylight fluorescent orange ink part 2 and a daylight fluorescent yellow ink part 3 adjacently on a base material 1.</p> |
