| 摘要 |
PROBLEM TO BE SOLVED: To provide detection of the counterfeiting, illegal alteration, and/or copying of a document. SOLUTION: A fluorescent mark indicator comprising a substrate containing optical brightening agents, a first spatial color pattern and a second spatial color pattern. The first spatial pattern is comprised of a first colorant mixture and a second colorant mixture in a first spatial pattern and printed as an image upon the substrate, and has as characteristics a property of high suppression of substrate fluorescence. The second spatial color pattern is further comprised of a third colorant mixture and a forth colorant mixture in a second spatial pattern, and printed as an image upon the substrate in close spatial proximity to the printed first colorant mixture pattern. Furthermore, the second spatial color pattern has a property of low suppression of substrate fluorescence and a property of low contrast against the first spatial color pattern, the resultant printed substrate image suitably exposed to an ultra-violet light source yielding a discernable pattern as a fluorescent mark. COPYRIGHT: (C)2008,JPO&INPIT |
