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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.
Common salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of salts; salt in its natural form as a crystalline mineral is known as rock salt or halite. Salt is present in vast quantities in seawater, where it is the main mineral constituent. The open ocean has about 35 grams (1.2 oz) of solids per litre, a salinity of 3.5%. Salt is essential for human life, and saltiness is one of the basic human tastes.