Black salt, also known as Kala Namak, is a type of rock salt that has a distinctive black color and a strong sulfurous smell. It is commonly used in Indian cuisine, and is said to have a number of health benefits.
Black salt is made by heating rock salt in the presence of sulfur. This process gives the salt its characteristic black color and smell. Black salt is also rich in minerals, including iron, potassium, and magnesium.