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<p>[QUOTE=&quot;Kentucky, post: 3327597, member: 33176&quot;][USER=100339]@gianni[/USER] there are a few chemists here, including myself, although I am an organic chemist.&nbsp; I think I have a way to change brown copper coins fully red, although it is tricky.&nbsp; Copper cons tend to turn brown over the ages due to the formation of copper oxide.&nbsp; If you can protect them from atmospheric oxygen, you are going a long ways towards preserving the original &quot;red&quot;.&nbsp; What country are you in?&nbsp; Are there any &quot;red&quot; copper coins from your country that are 70+ years old?[/QUOTE]</p><p><br /></p>

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