| 摘要 |
<p>The invention concerns a fiduciary document or the like (1), such as a banknote, passport, identity card, bank card, comprising a medium (2) whereon are provided security prints (3, 4). The invention is characterised in that the security prints include: a first print (3) produced in ink of a first colour (C>1<) invisible to the naked eye but fluorescent or phosphorescent; a second print (4) covering the first and produced in ink of a second colour (C>2<) visible or invisible to the naked eye but fluorescent or phosphorescent, the second print (4) being produced so as to blur the first print, such that in neutral light or ultraviolet illumination, only said second print (4) is visible, while the first print (3) is revealed only in ultraviolet illumination and through a filter of the same colour (C>1<) as that of the first print (3).</p> |
