Commentary for Avodah Zarah 63:1
האי חלא דשיכרא דארמאה אסור דמערבי ביה דורדיא דיין נסך אמר רב אשי ומאוצר שרי כיון דמערבי ביה מסרא סרי:
The vinegar which non-Jews make from beer is forbidden because they mix yeast of idolatrous wine in it. Ashi said: If it is from a storehouse it is permitted, for if it contained such admixture it would have been spoiled.
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