MAGNETIC THIN FILM INTERFERENCE DEVICE OR PIGMENT AND METHOD OF MAKING IT, PRINTING INK OR COATING COMPOSITION, SECURITY DOCUMENT AND USE OF SUCH A MAGNETIC THIN FILM INTERFERENCEDEVICE

摘要

The invention discloses magnetic OVP, said pigment consisting of thin-layer flakes having a basic metal-dielectric-metal structure to result in a viewing-angle dependent color appearance, and having, in addition to said viewing-angle dependent color appearance, incorporated magnetic properties, to make them distinguishable from OVP of similar appearance but not having said magnetic properties. The invention discloses as well methods for obtaining such pigments and the use of such pigments as security elements in inks, coatings and articles.