Back When tasting wine, the palate is responsible for flavour. While the tip of the tongue is sensitive to sweetness, acidity is perceived by the sides of the tongue and bitterness by the back. A small amount of wine should be placed in the mouth with a breath of air to help distribute the aromas. Alcohol is assessed by the sensation of warmth it gives. In addition to the four basic flavours, the astringency and volume of the wine can also be appreciated. The length is also very important.