Importance

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Abstract

Disclosed is a forgery prevention sheet comprising at least triple-layered construction including a base (2) and outer layers (1) and (3) formed on both side of said base. The outer layers have opacity of 20-92%, preferably of 40-92%. The inner surface of at least one (1) of the outer layers is printed with a fluorescent pigment ink into a predetermined design pattern. The printed pattern is not visible under the sunlight, but becomes visibly luminous to human's naked eye, when the sheet is irradiated with ultraviolet rays from the top and from the bottom. The sheet has no fluorescent ink on or near the top surface and, therefore, provides good printability when subjected to post-printing process with any printing system including a lithographic offset printing press, a laser printer and a thermal transfer printer. The sheet is particularly applicable to a tag label on big-name brands' care labels on clothing, on which a specific logotype or character representing its big-name brand may be printed with a unique visual pattern.

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First Claim