Black Salt Powder

Black Salt Powder or Kala Namak or Himalayan Black Salt also known as sulemani namak or kala noon, is a type of rock salt, salty and pungent-smelling condiment used in South Asia. The condiment is composed largely of sodium chloride with several other components lending the salt its colour and smell. Due to the presence of Greigite in the mineral, it forms brownish pink to dark violet translucent crystals when whole, and, when ground into a powder, it is light purple to pink in color.
Kala Namak is used extensively in South Asian cuisines of India, Bangladesh and Pakistan as a condiment or added to chaats, chutneys, salads, all kinds of fruits, raitas and many other savory Indian snacks. Chaat masala, an Indian spice blend, is dependent upon black salt for its characteristic sulfurous hard-boiled egg aroma.
Kala Namak is considered a cooling spice in ayurvedic medicine and is used as a laxative and digestive aid. It is also believed to relieve intestinal gas and heartburn. It is used in Jammu to cure goiters. This salt is also used to treat hysteria, and for making toothpastes by combining it with other mineral and plant ingredients.