The most significant constituent of wine, 75-90 percent, is water. The 15 percent variance is accounted for by the amounts of tannic acid, organic acids, mineral salts and pectins which form the win’s extract. As experienced wine buyers will agree, these percentages differ from wine to wine.
The second largest constituent of wine is ethyl alcohol. Experienced wine buyers know that alcohol content also varies according to the type of wine, and is given on the label as a percentage by volume (% vol). This information is compulsory and is not an indication of quality.
