Tartaric acid crystals

Tartaric acid crystals are produced, when natural minerals occuring in wine, such as potassium or calcium, are bound with tartaric acid. It occurs in almost every wine in a dissolved form and only forms little amber-coloured crystals, when it is cooled down during storage in a cold place. Nevertheless, tartar is completely harmless to health and does not affect the taste of the wine in any way.