Patent ID: 8602313

Claim:
A multilayer data carrier comprising: a substrate on which there is formed a security element having a metal layer, wherein said element shows an optical effect from a viewing side, wherein an impression of the optical effect produced by the security element is recognizable upon viewing in daylight, wherein the metal layer has recesses that have diameters of at most 200 μm so that the recesses are not, or at best poorly, recognizable to the naked eye in daylight and the recesses form a marking, wherein the recesses have a distribution so that clusters of the recesses are not, or at best poorly, recognizable to the naked eye in daylight, wherein a layer is formed on the substrate under the security element, the layer comprising a material that is excitable to glow by an external nondestructive physical action applied to the data carrier in such a way that the recesses become visible upon plan viewing from the viewing side, but the material is not excitable to glow in such a way that the recesses become visible upon viewing from the viewing side by daylight applied to the data carrier.