Patent ID: 7821675
Filing Date: 2010-10-26
Classification: B41M,B82Y,C09D

Abstract:
1. A method of marking an article with image indicia for authentication, information, or decoration, the method comprising the steps of: providing a plurality of inks that, when printed as image indicia on an article, fluoresce with a color when exposed to excitation energy and are substantially invisible under illumination within the visible spectrum; separating colors of the image indicia into a plurality of image levels; and printing each image level of said plurality of image levels in mutual registration on the article using said plurality of inks, wherein said printing is performed using an inkjet printer intended for use with subtractive-color ink, the plurality of inks including red, green and blue additive-color fluorescent inks, wherein said printing is performed using an inkjet printer, the method further comprising the steps of: converting indicia to be printed to a color negative form; and providing a set of red, green and blue additive-color inks within said plurality of inks that are complementary, respectively, to cyan, magenta and yellow subtractive-color inks.