INVISIBLE MULTICOLOR FLUORESCENT PRINTED MATTER AND ITS PRINTING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an invisible multicolor fluorescent printed matter, wherein a color at a part where adjacent two colors are superposed changes continuously, by using a plurality of fluorescent inks. SOLUTION: Continuos color change is generated by solidly printing a monochromatic part, continuously changing a halftone dot area ratio of one color from 0% to 100% on a superposed part of adjacent fluorescent inks, reversely changing halftone dot area ratio of the other color from 100% to 0%, and changing sum of both the area ratios from 50% to 150%.