| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a printed matter which is printed in a metameric pair ink, has a gradation image applicable to a valuable article, and enables truth discrimination. <P>SOLUTION: A plurality of first regions and second regions are arranged on a substrate to form a visible image with a density gradation. The second regions are arranged in the first regions by a hair tweezers doubling to form a latent image. By the first regions, an image is formed which excludes the second regions for constituting the latent image from the visible image with the density gradation. The first regions are printed in a first printing ink, and the second regions are printed in a second printing ink. The printing is performed in the inks with spectral reflectances of the first printing ink and the second printing ink approximated to each other in the range of a first wavelength within the visible region, and different from each other in the range of a second wavelength within the visible region. <P>COPYRIGHT: (C)2008,JPO&INPIT |
