Black salt is also known as Kala Namak in Indian. It is a volcanic rock salt. Black salt has a very distinctive sulfurous mineral taste. Black salt is purplish to pinkish grey in color. It is rich in iron. Black salt is best for High blood pressure and also cure flatulence and heartburn. It is used in chutneys, raitas, provides the tangy fresh flavor in chaat and many other snacks.