Metatartaric acid: locut. Metatartaric acid is a crystallization stabilizer. This acid prevents the formation of small crystals of tartaric acid which appear at the bottom of the bottle. This can be mistaken for the presence of sugar or even glass particles.
These crystals are nothing but tartar and have no organoleptic effect on the wine. The charter governing wines made from organically grown grapes prohibits the use of metatartaric acid ....
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