Black salt of India (Black salt - Indian kala namak). It is also known as Kala Namak and is mined from the volcanic regions of Pakistan and India. Its color is actually not black, but pink-gray due to the sulfur iron. It has a distinct smell due to hydrogen sulfide, similar to boiled egg yolk. Its composition varies according to its production method. Sodium sulfate and sodium bisulfite add a mild acidity to the taste. Synthetically prepared black salt does not contain minerals and trace elements, and n its sodium content reaches that of table salt. In Ayurveda, black salt is used for drumming, heartburn and as a laxative. Recommended for people with high blood pressure as opposed to common salt does not increase the sodium content in the blood, and to those who should limit it salt intake in their diet. Helps digestion, improve vision and soften the gut.