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<p>[QUOTE=&quot;Oldhoopster, post: 8130038, member: 84179&quot;]A nickel is made from an alloy that is 75% copper and 25% nickel.&nbsp; In order to remove the staining and corrosion byproducts, you need to know what chemicals caused the reaction and what components in the alloy reacted.&nbsp; Not an easy task. It can be a lot if trial and error.</p><p><br /></p><p>You could experiment with a variety of acids and chemical dips to see if something works.&nbsp; Actually, experimenting on damaged coins worth face value&nbsp; is a good way to learn the affects of cleaning.&nbsp; Just remember, what works for one coin, may not work for others.&nbsp; That&#039;s where a lot if experience, a little chemistry knowledge, and a little metallurgy can help[/QUOTE]</p><p><br /></p>

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