| 摘要 |
<p>A device for making security marks (1) by means of a plurality of simultaneously backing and printing dies (30), each with a pre-designed image (31), makes it possible to subject a sheet of paper (2) to an abrasion and printing method using the dies inked by inking rollers (25a-25d) with one or more inks not visible to the naked eye, but revealable by one or more temporarily applicable revealing stimuli: ultraviolet, infrared or polarized light, heat, etc., wherein the security mark (1) shows as authentication evidence a pre-designed image invisible to the naked eye, but which becomes visible in many different ways, such as one first verification against the light due to the image engraved on the obverse, and at least one second form of verification under a revealing stimulus: ultraviolet, infrared or polarized light, heat, etc., wherein all forms in which the images are revealed on the paper have an absolute matching location.</p> |
