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<p>[QUOTE=&quot;Cincimatti, post: 24705598, member: 16004&quot;]Epilogue: I do <u>not</u> recommend the baking soda, sodium carbonate mixture for treating copper coins. It leaves the surfaces with a porous texture and evidence of etching. You end up with a &quot;sandy&quot; coin in the worst case. </p><p><br /></p><p>Acetone only. Then work mildly with a cotton swab. (I do find that boiling the coin in soapy water first helps loosen the dirt - just don&#039;t use a kind that has blue dye added!) If the gunk doesn&#039;t come off easily, it&#039;s not a keeper.[/QUOTE]</p><p><br /></p>

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