Understanding Polyphenols Polyphenols present a classic dilemma for the brewer. On one hand, they taste bad. These bitter, astringent compounds— tannin is probably the best-known form of polyphenol — can ruin the
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IBU calculators most often used by brewers were developed prior to the popularity of adding massive hop additions after the boil. As brewing techniques evolve, the way we measure IBUs should too. A new model, dubbed SMPH, accounts for factors that have previously been overlooked, including separating isomerized alpha acids from auxiliary bittering compounds.
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To make a good eisbock (or any other kind of ice beer) it is helpful to have a good understanding of how ice crystals form, and to be able to effectively manage crystal formation within the beer.
