The characteristic of freshness in wine, akin to the acidity in lemonade or orange juice. Acidity stimulates the saliva glands in the back of your mouth, behind your molars. Acidity declines as wine ages, so more acidity initially (especially when the wine is also tannic) means more capacity for aging. Acidity is mostly determined by the grape variety, but growing grapes in cooler temperatures and at higher altitudes as well as vinifying in steel or concrete tanks (not wood) tends to increase acidity.

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