Ink compositions described are suitable for ink jet printing (ink jet inks) and are highly effective for simultaneously imparting visible and fluorescent images. In the preferred forms, both a dark, visible image and a complementary fluorescent image will be visually discernable as well as machine readable...http://www.google.fr/patents/US6827769?utm_source=gb-gplus-shareBrevet US6827769 - Photosensitive optically variable ink heterogeneous compositions for ink jet printing
Photosensitive optically variable ink heterogeneous compositions for ink jet ...
