A color shifting multilayer interference film is provided which may be used to produce foils or flakes for use in pigment compositions and colorants having color shifting properties. The flakes can be interspersed into a pigment medium to form paints, inks, or cosmetic preparations which can subsequently...http://www.google.se/patents/US6744559?utm_source=gb-gplus-sharePatent US6744559 - Color shifting carbon-containing interference pigments and foils
