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<p>[QUOTE=&quot;John Burgess, post: 4863880, member: 105098&quot;]What Suarez in that thread is talking about is sweat (salt, proteins, urea, and ammonia) will absolutely damage the surface of a coin and says it&#039;s unavoidable because of the minting practice of ancient copper coins. also unavoidable considering ancients will have spent time in wet soil or water that contains dissolved solids/minerals/salts/decaying proteins and carbons and only under perfect conditons 1 in a billion odds could a real &quot;mint state&quot; ancient copper coin exist.</p><p><br /></p><p>you can&#039;t &quot;restore&quot; copper coins to like new appearance/fresh copper without damaging the patina/discoloration.</p><p><br /></p><p>Every coin in that thread were at some point cleaned and preserved, likely not stripped of toning or patina, but cleaned of surface contaminants and preserved.</p><p><br /></p><p>Rinsing or short term soaking in distilled water does nothing but remove surface contaminants. Letting a coin sit in water for weeks, months years will have a negative effect. Fingerprints from sweaty hands will etch the surface of a coin over time.[/QUOTE]</p><p><br /></p>

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