Spanish term (also called the Solera-Criadera system) for the traditional storage and blending system for younger and older wines in the production of sherry, The process is also used alternatively in the production of Madeira. Malaga, Fires ( brandy. whiskey etc.) and vinegar (Wine vinegar) used. The name is derived from the bottom row of barrels (Solera = "lying on the floor"). A part of the fully developed or matured sherry is taken from the bottom row of barrels for marketing each year. The extraction (Saca) and filling (Rocío) from the row above are carried out from bottom to top.