The scientific name of bittern is bittern. After boiling salt with brine, the remaining black liquid is brine, which is a mixture of magnesium chloride, magnesium sulfate and sodium chloride. Because it can solidify protein into colloid, which is toxic to human body. Drinking brine is one of the main ways of folk suicide. Brine is an important raw material for making tofu, which makes protein in soybean milk coagulate into colloid and separate out water to make tofu. Tofu made of salt water is delicious. The proverb says: Bitter water makes tofu, and everything drops.
Lee Kum Kee brine juice is used for cooking pot-stewed dishes.