A security article includes a light transmissive substrate having a first surface and an opposing second surface, with the first surface having an embossed region with an optical diffraction pattern or a holographic image pattern. A color shifting optical coating is formed on the substrate such as on...http://www.google.de/patents/US7754112?utm_source=gb-gplus-sharePatent US7754112 - Methods for forming security articles having diffractive surfaces and color shifting backgrounds
