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alum

C2 noun

alum /ˈæl.əm/ nghĩa là phèn chua

Các nghĩa

  1. phèn chua

    An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (K₂SO₄·Al₂(SO₄)₃·24H₂O).

    countable · uncountable

    A natural astringent and antiseptic, potassium alum was coveted for its medicinal and cosmetic properties.

  2. phèn kép

    Any similar double sulphate in which either or both of the potassium and aluminium is wholly or partly replaced by other univalent or tervalent cations.

    countable · uncountable

    For similar reasons, aluminium sulphate and alums are used in dyeing cloth.[…]Normally alums are soluble in water and insoluble in alcohols.

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