Babylon
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I have looked through the thread on yeast washing, all sorts of good stuff in there, but I notice that, for the most part, people seem to be harvesting yeast from the bottom of the fermenter. According to Michael Jackson's Beer companion (not really a scientific source, but it made me think) ale yeast ferments mostly at the top and was traditionally harvested by scooping out the foam from an active fermentation. Does this mean that if we harvest from the bottom we are selecting for a more lager like yeast? Also has anyone experimented with harvesting yeast from the krausen rather than from the yeastcake on the bottom?