Patent ID: 8980504
Filing Date: 2015-03-17
Classification: B41M

Abstract:
1. A method for printing a substrate fluorescence mask on a substrate by a printing device for embedding information in printed documents, comprising: providing a substrate comprising optical brightening agents; receiving an indication from a user of at least one background color for the substrate fluorescence mask; selecting, based on the received indication of at least one background color, at least one UV mark color for the substrate fluorescence mask to be printed on the substrate as a first text string in a line of text, wherein said UV mark color exhibits a first contrast against said at least one background color under a first illumination and a second contrast against said at least one background color under a second illumination having a higher UV illumination than the first illumination, wherein said second contrast is higher than said first contrast; selecting, based on the received indication of at least one background color, at least one distraction color, wherein said distraction color exhibits a third contrast against said at least one background color under UV illumination and exhibits a fourth contrast against said at least one background color under the first illumination, wherein said fourth contrast is higher than said third contrast; and selecting at least one distraction pattern for the substrate fluorescence mask to be printed on the substrate in the distraction color as a second text string in the line of text which is interspersed with the first text string, wherein: printing the background color on the substrate; and printing the line of text comprising the first text string in the UV mark color and the second text string in the distraction color interspersed with the first text string.