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Noun: potash alum
  1. A white crystalline double sulphate of aluminium: the potassium double sulphate of aluminium
    "Potassium potash alum is commonly used in water purification";
    - alum, potassium alum

Type of: Al, aluminium [Brit, Cdn], aluminum [N. Amer], atomic number 13, double salt

Encyclopedia: Potash alum