When with respect to authentic distinction manner and its invisibility printed matter and that distinction

摘要

PROBLEM TO BE SOLVED: To provide an authenticity discriminating method for an invisible printed matter, the uneven pattern of which can be recognized under observation by adhering a discriminator to or by irradiating white light or the like on the invisible printed matter having an uneven pattern hard to be distinguished with naked eyes, its invisible printed matter and its discriminator. SOLUTION: By bringing the surface having the parallel line pattern or dot pattern printed thereon of the discriminator (2) made of a light transmitting board printed with the parallel line pattern or dot pattern into contact with an uneven pattern provided on the base material of the invisible printed matter (1) having the uneven pattern provided on the base material by printing with at least one selected from the group consisting of an ink having the same color with that of the base material, an ink with the hue similar to that of the base material and a transparent ink and being hard to be distinguished with naked eyes, the uneven pattern is visually recognized when the region brought into contact with the discriminator is observed.