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Medieval brewers used naturally-occuring yeast in flowers and leafy herbs which were added to the mix; they really did not understand where yeast came from and almost used it "accidentally", but understood that the yeast froth from a fermenting vat could be scraped off and used in the next batch.

The term for yeast in Middle English is goddes good, meaning God's Good, implying that it was a sacred and mysterious substance created and given by God.

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13y ago

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