Last Updated
：2025/11/22
copperas
（ plural ）
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iron(II) sulfate. / obsolete sulphate compound with one of three metals, zinc, copper or iron
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copperas
The old chemist kept a jar of copperas on the shelf to use in dyeing fabrics.
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The old chemist kept a jar of copperas on the shelf to use in dyeing fabrics.
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