Composition
Kala namak consists primarily of sodium chloride and trace impurities of sodium sulphate, sodium bisulfate, sodium bisulfite, sodium sulphide, Iron sulfide and hydrogen sulfide.
Sodium chloride provides kala namak with its salty taste, iron sulphide provides its dark violet hue, and all the sulphur compounds give kala namak its slight savory taste as well as a highly distinctive smell, with hydrogen sulphide being the most prominent contributor to the smell.The acidic bisulfates/bisulfites contribute a mildly sour taste. Although hydrogen sulphide is toxic in high concentrations, the amount present in kala namak used in food is small and thus its effects on health are negligible: Hydrogen sulphide is also one of the components of the odor of rotten eggs and boiled milk
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