PROBLEM TO BE SOLVED: To obtain a forgery preventive effect of a low cost by providing a color change region formed by using color change ink changing in color according to first and second directions on a cover for displaying attribute information, thereby drawing personality of a bankbook. ;SOLUTION: The bankbook 30 comprises regions 31 to 33 for displaying information and a color change region 50 on its cover. The region 50 is formed on an upper layer of part of the attribute information display regions 31 to 33 as the regions formed with images such as characters, graphic forms or the like by using the color change ink changing in color according to first and second angles. The region 50 is formed with the image by the ink for dispersing pigment laminated with a high refractive index layer and a low refractive index layer in transparent medium. The ink in which a layer of silicon oxide, titanium oxide, iron oxide or the like of high refractive index and a layer of mica or the like of low refractive index are, for example, laminated in transparent vehicle is used.;COPYRIGHT: (C)1999,JPO
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