CITRIC ACID, is an important organic acid, also known as tannic acid, a colorless crystal, often containing a molecule of crystalline water, odorless, strong sour, and soluble in water. Its calcium salt is more soluble in cold water than hot water, and this property is often used to identify and isolate citric acid. Anhydrous citric acid can be obtained by controlling the temperature at the time of crystallization. In industry, food industry, cosmetics industry, etc. have a lot of uses