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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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What are alpha acids?
Can someone explain what exactly an alpha acid is and why should I care about the alpha acid "rating" on the hops I use.