Patent ID: 6987868

Claim:
A genuine/counterfeit discrimination method, comprising identifying on a genuine/counterfeit discrimination object a combination of at least two of an electric field pattern, a magnetic pattern, an electron beam responsive pattern, an X-ray responsive pattern, and reflection or absorption patterns of visible light, ultraviolet light, and infrared light, using an electric field, a magnetic field, an electron beam, an X-ray beam, visible light, ultraviolet light, or infrared light, wherein the genuine/counterfeit discrimination object is a printed matter obtained by printing with a color ink composition comprising a powder of colored particles, said powder is prepared by coating base particles with a multilayered film so as to exhibit color by means of light interference, and to enable the particles to show a specific interference reflection peak in a region besides the visible light region, and said color ink composition is prepared by dispersing the powder into a dispersion medium for ink.