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Crossword clue: a double sulphate of aluminum and potassium that is used as an astringent (among other things)

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alum 4 letters wn-def

a double sulphate of aluminum and potassium that is used as an astringent (among other things)

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A double sulphate formed of aluminium and some other element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization.