Tartaric acid, a naturally occurring organic acid commonly found in grapes and used in winemaking. It has a sour taste and can be used as an acidulant, flavoring agent, antioxidant and chelating agent in food with the European food additive number E334. Generally, it is safe, natural or synthetic, vegan, halal, kosher and gluten-free.
http://www.chinafooding.com/L-Tartaric_Acid
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