Abstract: 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.

Abstract: There is proposed a multilayer data carrier (100) having a substrate (10) on which there is formed a security element (30) having a metal layer (32), said element showing an optical effect from a viewing side. In the metal layer (32) there are formed recesses (50) that are not, or at best poorly, recognizable to the naked eye in daylight and form a marking (60). However, the presence of the marking (60) is recognizable from a suitable viewing angle and upon suitable illumination. Preferably there is located under the metal layer (32) a fluorescent layer (20) which causes the marking (60) to become visible upon illumination by UV light.