| 摘要 |
A multilayer data carrier having a substrate on which there is formed a security element having a metal layer, the element showing an optical effect from a viewing side. In the metal layer there are formed recesses that are not, or at best poorly, recognizable to the naked eye in daylight and form a marking. However, the presence of the marking is recognizable from a suitable viewing angle and upon suitable illumination. Preferably there is located under the metal layer a fluorescent layer which causes the marking (60) to become visible upon illumination by UV light. |
