In the brewing process, the so-called”barrel” refer to the beer be put into oak barrel to continue fermenting and aging process. First barrel is a British invention, they make beer into 
a great deal of the cask for secondary fermentation in aging and to have more taste. Later Belgium people learned from the English oak and brew the first Landers red Al by secondary fermentation, which was very rich and cool acid taste. Aftre that, Belgium are used to produce a lot of sour beer barrel for secondary fermentation. 
 
       And since the 70 's of the last century, the craft brewery movement is developing in full swing , "bucket" that ancient brewing techniques have also been renewed. To United States for representative of craft brewery have new forces on” barrels"  , especially recently 10 years “ barrels” wave almost blow again on each craft brewery,, from acid beer to potent beer, even to wheat beer and IPA, almost all beer paragraph you are can found had barrels of version, some beer even had has more than once barrels.

Why brewers want to put beer into “barrel”?

1th: use the favor of wooden barrels. Barrel for many beer is one of the most important raw material, such as whisky, Bourbon, wine, brandy, dark rum, Sherry, port, and so on. Barrels tend to have rich flavor. Used wine barrels have many kinds,but the most widely used is oak (oak). In modern craft beer of the "barrel" process, the most frequently used is brewing a variety of wine left after a "second-hand barrels." These wood barrels in the often has other beer’s taste,  will absorption many these beer taste, let beer itself of taste more rich, rich, like in wave this barrels in the aging of reception has obviously of vanilla aroma and roast coconut oil of breath, and in brandy barrels or wine barrels in the aging of reception some fruit aroma and tannins of taste. Some hard alcohol barrel aged beer alcohol generally rises as well, but also will bring some warm taste of alcohol. Currently most used in beer barrel "used wooden barrels" is the United States Bourbonbarrels – that is because United States Bourbon barrel has a strong taste, and partlybecause the United States brewed using only the new barrel Bourbon, so very rich sources of used barrels. In addition to Bourbon barrels and barrels of beer barrels there, almost all of the barrels used for aging beer, such as Scotch whisky barrels, brandy barrels, wine barrels, and so on. For example, Bourbon county brand stout from goose island , is the first after strong barrel beer.
 
2nd: beer barrel is to take advantage of microbial secondary fermentation in barrels.
These beers are mostly sour beer. Due to some barrels of wine (especially the winebarrels) will be a lot of microbial residue, such as bacteria and wild yeast, so a lot of sour beer brewing is to use these organisms to produce sour (acetic or lactic acid) and other special flavor (such as using wild yeast Brettanomyces produces some 
 moldy sweet--funkiness). In all acid beer of type in, may only Germany of two species acid beer, Berliner Weisse and gose not need had barrels, other of acid beer almost are to had barrels brewing to guarantee sour and mold incense, some fruit acid beer more is to two times had barrels--first times produced sour, second times and fruit mixed stuffed makes sour, mold incense, and fruit taste harmony consistent.
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