The present invention discloses methods and systems for printing by superposing a metallic ink and transparent inks. These methods and systems are useful for color separating images into superpositions of a metallic ink and transparent inks both for design purposes and for the creation and authentication...http://www.google.fr/patents/US7491424?utm_source=gb-gplus-shareBrevet US7491424 - Reproduction of security documents and color images with metallic inks
Reproduction of security documents and color images with metallic inks
