Topic: Diacetyl in Beer
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How do You Eliminate or Reduce Diacetyl in Your Beers?
One way to accomplish the reduction in diacetyl is to use a diacetyl rest. A diacetyl rest is employed at the end of primary fermentation by slowly ramping the temperature up 5-10°F (1-2°C) above final fermentation temperature, to invigorat... Read More »
Source: http://www.winning-homebrew.com/diacetyl.html