All tequila begins as Blanco whether it is bottled directly from the still, or rested for at least two months, or aged for several years. The Mexican Standard for 100% Tequila specifies the length of time, type of wood and size of the aging containers. However distillers may use smaller barrels for additional aging and use different filtering systems.
It is tequila Blanco that has been kept in white oak casks or wooden tanks for more than two months and up to one year. The oak barrels give Reposado a mellowed taste, pleasing bouquet, and its pale color. Reposados keep the blue agave taste and are gentler to the palate.
It is tequila Blanco aged in 600-liter (160 gallon) white oak casks for at least one year. The amber color and woody flavor are picked up from the oak, and the oxidation that takes place through the porous wood develops the unique bouquet and taste.
It is tequila Blanco aged for at least three years in-600 liter (160 gallon) white oak casks. Some distillers additionally age these tequilas in smaller barrels. Extra Añejo enters into the big leagues of liquor both in taste and price.