... With the character of good heat-storing, high hardness and infrared, it is widelyused for human healthy, water treatment, spa ... 1) Tourmaline powder can persistently release negative ions, emit far infrared ray.Hence, it can purify air, accelerate the micro-circulation ... ,such as sofa, chair pad, bedding, clothing ornament and filter medium 3) After tourmaline negative ion powder is made into ...