A method of covering, embedding or burying magnetically encodable regions, invisible to the naked eye at least on one side, in a magnetic/metallic security device begins by providing a security device carrier substrate having an imaged metallic region. A foil film is provided on a release coated carrier...http://www.google.de/patents/US6549131?utm_source=gb-gplus-sharePatent US6549131 - Security device with foil camouflaged magnetic regions and methods of making same
