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Alpha acids (α acids) are a class of chemical compounds found in the resin glands of the flowers of the hop plant and are the main source of hop's bitterness contribution to beer. The Alpha Acids are isomerized during the boil, and it is the iso-alpha acids that contribute bitterness to the final product.

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Hop Utilization Resource

I like the IBU calculator in Beersmith. Available at www.beersmith.com. the trail version will let you use it for 14 days, and the whole program is only $19.99. It lets you change hop types and times …
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