| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for making a photochromic stamp image remember and keep a colored state and a decolored state tautomerically, and a tautomerically color-memorizing photochromic stamp tool utilizing the method. <P>SOLUTION: The stamp tool contains a photochromic ink comprising a photochromic compound having a photomemory function (color-memorizing photochromic property) and forming on the surface of an object a photochromic stamp image, which develops color by irradiation with ultraviolet rays or sunbeams containing ultraviolet rays, maintains the color-developed state, and is decolored by irradiation with visible light to change into a decolored state. The stamp tool is equipped with a color-changing means, which contains an ultraviolet absorbent and/or a light-shielding pigment shielding at least ultraviolet rays to cut ultraviolet rays in the sunbeam and decolors the photochromic compound in the colored state by irradiation with visible light thereby to change it into and keep it in the decolored state. The color-changing means is arranged so as to contact or not to contact with the photochromic image thereby to tautomerically memorize and keep the colored state and the decolored state. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
