a double sulphate of aluminum and potassium that is used as an astringent (among other things)
Its definition shares important concepts with this word: green, vitriol, sulphate, iron, crystalline.
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Copperas
Green vitriol, or sulphate of iron; a green crystalline substance, of an astringent taste, used in making ink, in dyeing black, as a tonic in medicine, etc. It is made on a large scale by the oxidation of iron pyrites. Called also ferrous sulphate.
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