Patent ID: 8962065
Filing Date: 2015-02-24
Classification: B41M,B42D

Abstract:
1. A method for applying a composite security element to a substrate using a printing apparatus, the printing apparatus comprising at least a first marking material applicator and a second marking material applicator; the composite security element comprising a first pattern mark and a second pattern mark; the method comprising: marking the first pattern mark in a first marking material on the substrate using the first marking material applicator in a predetermined area of the substrate; and, thereafter, marking the second pattern mark in a second marking material on the substrate in a space around the first pattern mark and within the predetermined area using the second marking material applicator, wherein the second marking material is different from the first marking material, and wherein the marking of the second pattern mark renders the first pattern mark and the second pattern mark indistinguishable from one another by a naked human eye within a visible spectrum of light and wherein the first pattern mark and the second pattern mark are substantially invisible to the naked human eye in radiation of wavelengths within the visible spectrum, wherein the space for marking the second pattern mark is only an unmarked area of negative space that is: around the first pattern mark, within the predetermined area, and unmarked by the first marking material; and wherein the marking of the second pattern mark further comprises marking entirely in all of the unmarked area of the negative space around the first pattern mark and within the predetermined area of the substrate that is unmarked by the first marking material.