Black salt or Kala namak is a type of rock salt, a salty and pungent-smelling condiment used in South Asia. Although it is called black salt, its color is not black; it has a purple-ish to pink-ish color. Due to its sulfur content, it tastes and smells like hard-boiled egg yolks. This salt is used in many vegan/eggless recipes to mimic the flavor of the eggs. Keep in mind, Black salt or Kala namak is salt, so use it in moderation. I only use it to add the u0022eggyu0022 taste to some eggless recipes, not as a salt substitute.