| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a document in which a mark is embedded without using any special ink to be used by UV or IR1. <P>SOLUTION: A document may include: a non-magnetic substrate; a first colorant mixture 300 printed as a first image upon the substrate and having a character of high magnetic contrast in relation to the substrate; and a second colorant mixture 301 printed as a second image upon the substrate in substantially close spatial proximity to the printed first colorant mixture, and having a character of low visual contrast with respect to the first colorant mixture 300, such that the resultant printed substrate does not reveal the first image to the human eye but will reveal a magnetic mark, which is identifiable when checked using a magnetic image reader, as a magnetic mark. <P>COPYRIGHT: (C)2011,JPO&INPIT |
