MAGNETIC POWDER FOR INK USED FOR DISTINGUISHING TRUTH FROM FALSEHOOD, METHOD FOR PRODUCING THE SAME, MAGNETIC INK USING THE SAME, PRINTING MEMBER USING THE SAME AND USED FOR DISTINGUISHING TRUTH FROM FALSEHOOD, DEVICE FOR DETECTING THE SAME, AND DEVICE FOR DISTINGUISHING TRUTH FROM FALSEHOOD

摘要

PROBLEM TO BE SOLVED: To obtain a magnetic ink which has good readout sensitivity and good durability, can be applied to various printing techniques, has a high counterfeit-preventing effect, and enables the distinguishment of truth from falsehood in high reliability and at a high distinguishing rate. SOLUTION: This magnetic ink uses oxide magnetic powder having a Curie temperature of -50 to 150 deg.C and an average crystal particle diameter of =10 μm.