Chapter 4

Brewers Yeast

Ale Yeast

Ale yeast strains are best used at temperatures ranging from 10 to 25C, though some strains will not actively ferment below 12C (33). Ale yeasts are generally regarded as top-fermenting yeasts since they rise to the surface during fermentation, creating a very thick, rich yeast head. That is why the term "top-fermenting" is associated with ale yeasts. Fermentation by ale yeasts at these relatively warmer temperatures produces a beer high in esters and higher alcohols, which many regard as a distinctive character of ale beers.

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