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<p>[QUOTE=&quot;Just Carl, post: 100462, member: 4552&quot;]Actually Copper Sulfate is not normally available. It almost always has to be made. CuSO4 comes from an abundance of O during formation. In our air there is SO and SO2 from Sulfur burning coals at factories and power stations. The SO and/or SO2 combines easily with moisture, H20 (H 0H actually) to form the Sulfurus Acid, not Sulfuric, that causes corrosion on many things. On Copper coins, pipes, etc. it leaves a greenish residue (corrosion) that is caused by CuS03 and/or CuS04 if sufficient O is available.</p><p>If corrosion on a Copper coin is not green it is not from Sulfinating.[/QUOTE]</p><p><br /></p>

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