Anticounterfeit ink and the printed matter and Antifalsifying Antifalsifying method

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PROBLEM TO BE SOLVED : To obtain an ink for preventing counterfeiting and a print capable of preventing counterfeiting which are very hard to counterfeit by a copying machine and, at the same time, can be produced at a low cost and enable clear distinction of the genuine print from a counterfeit by the use of a simple device, and simultaneously, have many color variations. SOLUTION : The ink for preventing counterfeiting contains a lanthanoid rare earth compound and a coloring material such as a pigment and a dye in the mixed state, and a print 1 having a printed portion 12 which prevents counterfeiting and is provided by the use of this ink is provided.