| 摘要 |
The invention relates to an achromatic security element for value documents, such as banknotes, cards, ID documents and the like comprising a thermoplastic or a radiation-curable polymer layer, characterised in that the layer is embossed with diffusely reflecting microstructures having sizes in the order of 1 - 100 µm, a method for producing such security elements, value documents comprising said security elements and a currency system comprising said security elements. |
