Patent Document ID: 8947744
Application ID: 13526820
Patent Status: 1

Claim One:
1. A print media having printed image content and visibly hidden content embedded in the printed image content, comprising: the image content printed with one or more visible colorants to provide images or text; the hidden data provided by selective printing of at least one spectral edge marker material in combination with the one or more visible colorants onto at least one image region of the print media to provide visually hidden data, wherein the spectral edge marker material has a substantial spectral absorption just outside the human visible spectrum; wherein the at least one visible colorant is color matched to the combination of spectral edge marker material and the at least one visible colorant, and is at least printed on the print media in image regions having the at least one selectively printed spectral edge marker material; and wherein the substantial spectral absorption of the spectral edge marker materials, as indicated by an optical density (D), has an optical density D≧0.5.