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<p>[QUOTE=&quot;SuperDave, post: 2902764, member: 1892&quot;]You can put a toned silver coin - even one which is near-black, in many cases - into an electrolysis process and remove the toning. As if it never happened. The original coin will return. No silver will be gone, or physically altered. Is that &quot;permanent damage?&quot;</p><p><br /></p><p>This isn&#039;t some black magic; it&#039;s chemistry. It&#039;s a reaction between silver and sulfur to form silver sulfide, and it can be reduced.[/QUOTE]</p><p><br /></p>

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