The fortified wines are produced from grape which must reach a maturity of at least 252 grams sugar per liter must, or close to 15 per cent of
potential alcohol, which corresponds to very mature grapes. The allowed base
yield is 30 hectoliter per hectare. The wine must be fortified by the addition of neutral alcohol (with a minimum strength of 96 per cent by volume), the volume of which must correspond to 5 to 10 per cent of the volume of the grape must. The alcohol level of the finished wine must be at least 15 per cent, and a maximum of 21.5 per cent by volume, and the sugar content at least 45 grams per liter. There are two special designations which can be used for Rasteau wines: • Wines marked ''Hors d'âge'' must be stored for five years before it is sold. • Wines marked
Rancio must have been subjected to the typical oxidative treatment of that wine style. == References ==