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Reference.org
Copper sulfate
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<p>Copper sulfate may refer to: </p> <ul><li><a href="/facts/Copper(II)_sulfate/Ya6fPoQe">Copper(II) sulfate</a>, CuSO4, a common, greenish blue compound used as a fungicide and herbicide</li> <li><a href="/facts/Copper(I)_sulfate/q2zMdTA8">Copper(I) sulfate</a>, Cu2SO4, an unstable white solid which is uncommonly used</li></ul>