Reference for Niddah 33:14

ולא אמרן אלא דלא שייר בהן עיקרן או קליפתן אבל שייר בהן עיקרן או קליפתן לית לן בה

'And drinking diluted liquids that were kept over night'. Rab Judah citing Samuel explained: This applies only where they were kept over night in a metal vessel. R. Papa stated: Vessels made of alum crystals are the same in this respect as vessels made of metal. So also said R. Johanan: This applies only where they were kept in a metal vessel; and vessels made of alum crystals are the same in this respect as vessels made of metal.

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