Diacetyl Test

My Lab Assistant Doing Diacetyl Test


So how do you know if your young beer will need a diacetyl rest? There is a simple test which any homebrewer can do that will answer that question. It requires two glasses , some foil or plastic wrap, some hot water at 140-160°F (60-71°C), and some cold water. The principle is simple. At warmer temperatures, the precursor to diacetyl, alpha-acetolactate (AAL), will oxidize quickly into diacetyl in your young beer. In essence, you will be testing for the presence of excessive levels of AAL in your beer. So, here is how the test goes…

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