Oud bruin

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Oud Bruin
Liefman's oud bruin
Country of origin Belgium
Yeast type Top-fermenting
Alcohol by volume 4 - 8%
Color (SRM) 15 - 22
Bitterness (IBU) 15 - 25
Original Gravity 1.043 - 1.077
Final Gravity 1.012 - 1.016
Malt percentage 90% - 100%

Oud Bruin (Old Brown), also known as Flanders Brown, is a style of beer originating from the Flemish region of Belgium. The Dutch name refers to the long aging process, up to a year. It undergoes a secondary fermentation, which takes several weeks to a month, and is followed by bottle aging for several more months. The extended aging allows residual yeast and bacteria to develop a sour flavor characteristic for this style.[1] While some examples of an Oud Bruin may be aged in oak, typical beers in this style are not, and this is what helps Flanders Brown ales distinguish themselves from the more sour Flanders Red ales.[2] Usually, cultured yeast and bacterias are used, as stainless does not harbor wild organisms as wood does.[3]


These beers were kept as so called provision beers, to be stored and allow the flavor to develop. Liefmans Brewery has been brewing the style since the 17th century.[3] Historical examples tended to be more sour and acidic than modern commercial products.


This style of beer is medium bodied, reddish-brown, and has a gentle malty flavor and no hop bitterness. Commercial versions may mix aged beer with younger, sweeter beer to temper the acidity and allow for further fermentation.[4]


  • Ichtegem's Oud Bruin
  • Liefmans Goudenband
  • Petrus Oud Bruin
  • Hertog Jan Oud Bruin
  • Brouwers Verzet Oud Bruin
  • Deschutes The Dissident


  1. ^ Rajotte, Pierre (1992). Belgian Ale. Boulder, Co: Brewers Publications. p. 14. ISBN 9780937381311. 
  2. ^ "2008 BJCP Style Guidelines". Category 17 — Sour Ale. Beer Judge Certification Program. Retrieved 6 April 2014. 
  3. ^ a b "Flanders Brown / Oud Bruin". Beer Connoisseur. 2 September 2009. Retrieved 6 April 2014. 
  4. ^ Michael Jackson "The Great Beers of Belgium"

External links[edit]

  • Media related to Oud bruin at Wikimedia Commons