To obtain multifunctional ink which simultaneously releases negative ions, radiates infrared rays, and prevents the generation of static electricity.

This ink is prepared by compounding a pigment or a dye into a resin composition which is prepared by mixing a hardly statically chargeable resin with a mixed powder comprising a rare-element-containing mineral and either tourmaline or an infrared-radiating ceramic. The ink exhibits such multifunctionality that it releases negative ions having activating effects on the cells of human bodies and improving effects on the health and it emits infrared rays accelerating blood circulation.