It is widely popular in Hokkaido, Japan. The reason is that the "Blackstone" produced by Hokkaido and is certified by the Japanese trademark. The raw material of the ore is mainly under the sea floor of 3000 meters. After 10 million years of crustal movement and volcanic eruption, pressed into a stone-like product, is currently containing anion and far infrared energy of the highest products.

The sea mud by the volcanic eruption of the high temperature melting which have high negative ions, by the orogenic movement into a crystalline rock, the energy is concentrated in the crystal rock, so the energy can be lasting. It has to promote the role of metabolism, to adjust the physiological function, detoxification, beauty and enhance the unique efficacy of immunity. Now in Japan, Taiwan's hot springs are the introduction of this red "Hot Stone Spa".