DL‑Tartaric Acid (CAS No. 133-37-9; Chemical Formula: C₄H₆O₆) is a white, crystalline organic acid that exists as a racemic mixture of D- and L- isomers. It is water-soluble and commonly used as a buffering agent, antioxidant, and pH adjuster in foods, chemicals, and pharmaceutical applications. Purity ≥99%.