Tartaric acid is a natural compound found in many vegetables, mainly in fruits, and especially in grapes. It is found as a free form or as salts.This tartaric acid is isolated from by-products of the wine making (white wines generally). Water is the only solvent used in the manufacturing process. Product of food grade.Natural dyeing : for the mordanting of wool and silk, in addition to alum, tartaric acid gives different shapes than those obtained with the cream of tartar. Recommended also for cochineal dyeing.