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<p>[QUOTE=&quot;Michael K, post: 3964193, member: 78298&quot;]I know what the melting point of copper is.</p><p>There are other chemicals involved but it doesn&#039;t take 1085 degrees Celsius to remove 20 microns of copper plating.</p><p>The plating is removed without melting the zinc.</p><p><br /></p><p>Sodium hydroxide - 10g</p><p>Sulfur - 15g</p><p>Add water to 100ml</p><p>First, boil for 30 minutes to dissolve the sulfur.</p><p>Then, put the penny in and run it at 185-205F to convert the copper to copper sulfide, which is a loose coating that is easily removed.</p><p><br /></p><p>There is even a You Tube video showing the process.[/QUOTE]</p><p><br /></p>

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