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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, the obligatory precaution is that after the wine has turned into vinegar, the outside of the container must be avoided [i.e. it is ruled as being impure].