Tartaric acid Food Grade is a white crystalline diprotic organic acid. The compound occurs naturally in many plants, particularly in grapes, bananas, and tamarinds. It is also one of the main acids found in wine.

Tartaric acid can be added to food when a sour taste is desired. It is also used as an antioxidant. Salts of tartaric acid are known as tartarates. The chemical is a dihydroxy derivative of succinic acid.