INK AND PRINTED MATTER FOR PREVENTING FORGERY

摘要

PROBLEM TO BE SOLVED: To discriminate easily the forgery utilizing a copier of high resolution by setting the component ratio of a coloring material and a pearl pigment contained in ink in the specified range. SOLUTION: The component ratio of a pearl pigment coating a metal oxide which is transparent in a visible zone provided with refraction properties of 2.0 or more as the metal oxide providing reflection properties to a coloring material of a yellow component as the brightest color separation component contained in ink and mica is set in the range of 1:0.1 to 1:99. When a background section 3a and a latent image section 2a are printed by using ink having set the above-referred range, a copied matter 4a in which the latent image section 2a is decolored and the background section 3a is color changed is formed by copying by a color copier. Forgery utilizing the color copier of high resolution can be discriminated easily by the arrangement to prevent the forgery by the color copier.