Pioneering technology leaves counterfeiters behind
RollingStar’s many optical and functional features are only possible thanks to the combination of micromirror technology and colour change effects. As the name suggests, the mirrors in question are extremely small and reflect light. Typically, a mirror reflects white light, rather than splitting up the individual colours. Unlike most everyday mirrors, however, the RollingStar mirrors are not made of glass but are embossed.
Fig.: Several million micromirrors are positioned on an area of 1 cm²
Fig.: An additional ColourShift vapor deposition is important for the characteristic RollingStar colour change
An area of 1 cm² holds several million facets. Each of these tiny mirrors is positioned at a specific angle calculated precisely beforehand by special software designed for this purpose. The movement effect is created by the exact alignment of the vast number of reflective facets. When light hits the surface, its reflection moves across the note when it is tilted. Here, too, the reflection is initially white. Only in combination with multi-layered vapor deposition is an additional, exactly defined colour change generated by tilting the note. Even the smallest deviations in the layer thicknesses would lead to a different colour appearance.
United we are strong: RollingStar and SICPA SPARK®
Synchronization of the RollingStar effect with optically variable printing processes (such as OVMI SICPA SPARK) opens up additional security potential. Two completely distinct security features are thus synchronized and used in tandem. This makes it even easier for the public to identify genuine notes. Furthermore, synchronising two high-tech security features from different production stages – paper manufacturing and banknote printing – increases protection against counterfeiting.