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Ruling 209

If wine turns into vinegar, its container also becomes pure up to the level where the wine reached at the time of fermentation; and any piece of cloth or object that is usually placed on top of it also becomes pure if it had become impure by the wine. However, if the outside of the container had become impure by the wine, due to its fermenting, then it does not become pure by subsequence based on obligatory precaution.