INK COMPOSITION, PRINTED MATERIAL AND DETECTING DEVICE

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PROBLEM TO BE SOLVED : To prevent a confidential information from being easily leaked when a confidential indication is added to an article by using a fluorescent substance, and the confidential information is recognized by irradiating the indication with an exciting light and observing the generated fluorescence. SOLUTION : The indication having the confidential information is added to a material to be printed by using a transparent ink composition containing a rare earth fluorescent substance containing a rare earth element such as Eu having 310-330 nm exciting wave length and 600-650 nm fluorescent wave length as an activator. COPYRIGHT : (C)2007, JPO&INPIT