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The Health Benefits of Black Salt. Salt is one of those substances that humans depend upon, not only for its taste, but also for its health benefits and its ability to preserve food. The Indian black salt, also known as 'Kala Namak', is a popular variety of Indian volcanic stone salts. It is used extensively in India, Pakistan and internationally, by those who know its benefits. Its unusual color comes from the presence of tiny amounts of iron and other minerals.
Quick Answer. Potassium nitrate is commonly known as saltpeter. It is an ionic salt made up of potassium and nitrate ions, with a chemical formula of KNO3. It is famous for being a key ingredient in black powder, which was used as firearm propellant until the 20th century.