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For the traditional '''Solera''' process used in sherry, vinegar, and brandy production, [http://en.wikipedia.org/wiki/Solera ''see the Wikipedia article on Solera'']. In beer, particularly sour beer, a single stage Solera process has been discovered to be a reliable and easy way to continuously make sour beer.
The process of using a ''solera'' method in sour beer brewing is traditionally filling a single fermenter with a sour beer, and every 6-12 months taking about a one third or half (and sometimes more than one half) of the beer out for packaging. That volume is then replaced with new beer or wort. This method provides the brewer with an "everlasting" sour beer that takes less time to age because of the blended components. Over time the beer can continue to develop and change, and the brewer has the option of trying to steer the beer by altering the recipe for the wort or beer used to refill the ''solera''. As a rule of thumb, the larger the fermenter the better. This will allow for larger seasonal pulls from the ''solera'', thus producing more beer.
==Articles on Solera==