| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide such a forgery preventive ink as comprises the forgery preventive ink which is seen as a usual Indian ink because of showing a black color on a visual observation under the sunshine or a fluorescent lamp and which permeates a wavelength region of a part of the visible light and has the high light resistance, consequently its authenticity can be judged easily by distinguishing the reflected light from the optional visible light and infrared light irradiated and furthermore as comprises a forgery preventive ink which permeates a light of a part of the wavelength region of the visible light and absorbs a light of a wavelength region of a part of the infrared light, consequently is effective for the prevention of leakage in the real information, and to provide a forgery preventive medium and a forgery preventive sticker using this. <P>SOLUTION: The forgery preventive ink is characterized by comprising as the main component a pigment which shows a black color on a visual observation under the sunshine or a fluorescent lamp and has the permeable width of wavelength region of 50 nm or more among a visible light of 400 nm-780 nm and which permeates a light of a near infrared ray of the wavelength region of 780 nm-1,400 nm and contains no metal. <P>COPYRIGHT: (C)2010,JPO&INPIT |
