Solera by the producers of sherry. In a Spanish sherry "solera", the vintner may transfer about a third of each barrel a year. A solera sherry has to be at least three years old when bottled. A quite similar process is called sostrera, used to produce fortified wines in the Mediterranean regions of France. In Sicily, where Marsala wine is made, the system is called "in perpetuum". Solera vinification is used in the making of Mavrodafni ("Black Laurel"), a fortified red dessert wine made in the Northern Peloponnese in Greece. Exceptional "Mavrodafni" vintages are released every 20 or 30 years: they
Marsala wine Palermitano by adoption, bought up great swathes of land between the two largest established Marsala producers and set to making his own vintage with even more exclusive range of grape. Florio purchased Woodhouse's firm, among others, in the late nineteenth century and consolidated the Marsala wine industry. Florio and Pellegrino remain the leading producers of Marsala today. Marsala is produced using the Grillo, Inzolia, Catarratto and Damaschino white grape varietals, among others. Marsala contains about 15–20% alcohol by volume. Different Marsala wines are classified according to their color, sweetness, and the duration of their aging. The three levels of sweetness