The raw materials of the Sea Salt are selected from pure, food grade and contain all kinds of trace elements which found in nature seawater, as well as some other special vitamins and protective colloids. The sodium chloride（NaCl）of Blue Treasure Salt is purified from pure, non-pollution underground brine. It is from an very rare underground brine sources in the world, In addition to this, the Blue Treasure Sea Salt get the formula after many experts research of Ocean University of China, since 1996.