those used for vin doux naturels are often 95%. The spirits are then added to the VdNs later in the fermentation process than with Port. More of the fortifying spirits are often used in Port production, representing up to a fifth (20%) of the finished volume of wine compared to the spirits accounting for around 15% of the finished volume of the VdNs. This means that most VdNs contain less water and alcohol than the typical Port wine. Vintage dating While vintage Maurys do exist, most wines are a blend of several vintages with some producers even utilizing a solera system of fractional blending similar to Sherry. These wines will often have an estimate age of "bottle date" listed on the wine label instead of a vintage. Since 1975, more producers have experimented with "vintage" Maurys (called Rimage in neighboring Banyuls). These are wines that are bottled early, often without rancio or barrel aging. The wines have a very dark red color with strong cherry and ripe flavors with noticeable tannins. AOC regulations When Maury was first granted its AOC, the minimum Grenache percentage required was only 50%, but that figure has risen steadily over the years and today Maury wines must be made from at least 75% Grenache noir with pre-2000 vintages grandfathered to require minimum of 70%. In reality, most Maury are 90-100% Grenache though other varieties are permitted to be used. These include Macabeo, which is limited to constituting no more than 10% of the blend (15% maximum for pre-2000 vintages), and Carignan, Cinsault, Listan Negra and Syrah which collectively can not make up more than 10% of the blend. Other white grape varieties beyond Macabeo are also permitted including Grenache blanc, Grenache gris, Tourbat, Muscat Blanc à Petits Grains and Muscat of Alexandria. Grapes destined for AOC wine production in Maury are limited to a harvest yield no greater than 30 hectoliters/hectares (approximately 1.6 tons/acre). When the fortified spirits is added is not specifically regulated but the finished wine must have a minimum alcohol level of at least 15%. Non-fortified table wines produced in the southern reaches of Maury AOC along the Agly valley have been previously eligible for the Côtes du Roussillon-Villages AOC or to be sold as a vin de pays under the Vin de Pays des Côtes Catalanes designation. For the 2011 vintage, a new AOC designation of Maury Sec was introduced to