Black salt or volcanic rock salt comes from the Himalayas. It is a processed salt that begins as pink Himalayan salt. This heated and mixed with herbs and spices, including haritaki which has a sulfuric odor. This salt is high in minerals, but it also has a distinctive aroma and taste so it is not an exact substitute for table salt. It has many medicinal uses, including use as a tooth powder. It can be made into a paste and applied to the forehead. There are actually countless culinary as well as therapeutic uses, but for oral hygiene purposes, we are offering it as a substitute for toothpaste since it is detoxifying. The color varies from grayish to purplish-black. The salt we offer is very finely ground, almost more like powder than a crystal.