2. Know that not all beer foams alike
Having a head (foam) on top of your beer isn’t always bad. In fact, it’s preferred for certain beer styles. Some styles have large heads because they’re unfiltered, like wheat ales—the result of residual yeast, hops, and proteins. Foam, which is around 20% beer mixed with gas, can get rid of carbon dioxide that imparts a bitter taste. It can also produce subtle changes in the texture of beer that can’t be achieved in the brewing process. If you plan to drink a cask-conditioned ale, or one from a barrel rather than a keg or bottle, expect very little head (if any) and a mouthfeel that’s a bit flat.
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