AUTHENTICITY DISCRIMINATION PRINTED MATTER DISCRIMINABLE IN TERAHERTZ REGION AND AUTHENTICITY DISCRIMINATION METHOD OF THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an authenticity discrimination printed matter in which information is formed in a base material by use of pair inks comprising fullerene that cannot be discriminated by IR spectroscopy or Raman spectroscopy and thereby high concealing property of the material is achieved, in a technical field for discriminating authenticity by detecting characteristics of a terahertz spectrum by mechanical reading.SOLUTION: The authenticity discrimination printed matter of the present invention includes a printed image on at least a part of a base material, the printed image including a first print region printed with a first ink comprising fullerene (C) and a second print region printed with a second ink comprising a lithium-included fullerene salt ((Li@+C)/(PF)). When the printed image is irradiated with terahertz waves in a predetermined frequency region, absorption spectra and/or terahertz transmission images of the first print region and the second print region are different from each other near 2.5 THz frequency of the terahertz waves.SELECTED DRAWING: Figure 1