If there's any sweetness in a wine whatsoever, you'll get it right away. Fruit and Varietals Characteristics-Found in the middle of the tongue. Acidity-Found at the sides of the tongue, the cheek area, and the back of the throat. White wines and some lighter-style red wines usually contain a higher degree of acidity. Tannin-The sensation of tannin begins in the middle of the tongue.
Tannin frequently exists in red wines or wood-aged white wines.
When the wines are too young, tannin dries the palate to excess. If there's a lot of tannin in the wine, the tannin can actually coat your whole mouth, blocking the fruit. Remember, tannin is not a taste. It is a tactile sensation. Aftertaste-The overall taste and balance of the components of the wine that lingers in our mouth.