The University of Pennsylvania has found that the Chinese may have been fermenting alcoholic beverages and wine as early as 6000 B.C. This is due to evidence of tartaric acid that has been found on shards of Chinese pottery.
Tartaric acid is an organic acid. It occurs naturally in many plants (ex: grapes, bananas). It is one of the main acids found in wine. It is added to other foods to give it a sour taste, and it's used as an antioxidant. Salts of tartaric acid are known as tartrates. You may even have a bottle of this in your kitchen that you use to cook with!
Be careful not to confuse "Cream of tartar" with "Tartar sauce"..."Cream of Tartar" is the potassium salt of tartaric acid.