The most common sherry wines used to the cask seasoning are oloroso wine, cream wine and Pedro Ximénez wine. Oloroso is a dry sherry, Pedro Ximénez is a naturally sweet wine and cream is a generoso liqueur wine, that is, a wine obtained by blending the two previous. These wines are aged through an oxidative process, so they develop dark colours and different degrees of sweetness (Ortega, Lopez-Toledano, Mayen, Merida, & Medina, 2003). A few producers have started to age their brandies in casks seasoned with fino wine or manzanilla wine. The difference between these wines is mainly legal, that is, the first is aged in the cities of Jerez de la Frontera and El Puerto de Santa María, whereas the second is aged in Sanlúcar de Barrameda. These wines are aged through a biological process, where a layer of yeasts grows up in the surface of the wine (Ibeas, Lozano, Perdigones, & Jimenez, 1997). The main effects of this layer are the protection against oxidation from air, which makes wine remain in a very pale and clear colour, consumption of ethanol and release of different compounds such as