Tartaric Acid is an important food additive that has a sharper more sour taste. It is considered to have a more biting level of tartness than Citric Acid. Tartaric acid can also help set gels or act as a food preservative in foods. Tartaric Acid is a natural crystalline compound most often found in grapes and is the principal acid in wine and the component that promotes aging and crispness of flavor. It is also used as an antioxidant. Gluten-free Size: 90 g / 3 oz.