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How to remove dark patina/corrosion/??? From Buffalo nickels?
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<p>[QUOTE="desertgem, post: 8370746, member: 15199"]I think johnmilton is correct. Nickel oxide has 2 major forms of oxide. One follows the normally expected chemical oxidation and is Ni(II)Oxide and is green NiO. This is not copper verdigris and is normal oxidation in open atmosphere. If the Nickel atoms are exposed to reduced oxidation ( low oxygen availability ) a chemical oddity develops which is Ni(III)Oxide and is black Ni2O3 which is not common as it requires specific conditions over a period of time with low oxidation. I would just leave it as it is , unless you are a chemist familiar with stoichiometry techniques and have the lab equipment. Jim[/QUOTE]</p><p><br /></p>
[QUOTE="desertgem, post: 8370746, member: 15199"]I think johnmilton is correct. Nickel oxide has 2 major forms of oxide. One follows the normally expected chemical oxidation and is Ni(II)Oxide and is green NiO. This is not copper verdigris and is normal oxidation in open atmosphere. If the Nickel atoms are exposed to reduced oxidation ( low oxygen availability ) a chemical oddity develops which is Ni(III)Oxide and is black Ni2O3 which is not common as it requires specific conditions over a period of time with low oxidation. I would just leave it as it is , unless you are a chemist familiar with stoichiometry techniques and have the lab equipment. Jim[/QUOTE]
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