FORGERY PREVENTIVE INK AND FORGERY PREVENTIVE MEDIUM USING THE SAME, AND VERIFICATION METHOD OF FORGERY PREVENTIVE MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a forgery preventive ink which visually takes on black under sun light and a fluorescent lamp, the authenticity of which is determined in a near infrared region, and which is inexpensive, requires a complicated authentication method and is very difficult to be forged, and has improved security, and to provide a forgery preventive medium using the forgery preventive ink, and an authenticity determination method of the forgery preventive medium.SOLUTION: The forgery preventive ink visually takes on black under sun light and the fluorescent lamp, absorbs light in a part of wavelength of the near infrared region, transmits light in other near infrared waveform region, and has a fluorescent function which by being irradiated with light having a selected near infrared wavelength, emits light having a near infrared wavelength different from the selected near infrared wavelength.