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<p>[QUOTE=&quot;Harryj, post: 393835, member: 14623&quot;]Copper doesn&#039;t &quot;rust&quot; so to speak. Most corrosion is &quot;verdigris&quot; (bronze disease) or pvc damage from storage in the older pliable plastic coin flips. Verdigris is greenish corrosion and pvc is greenish with a &quot;gummy&quot; look. I have read that verdigris can spread from coin to coin so it&#039;s a good idea to isolate the affected coins.</p><p>&nbsp;</p><p>Be careful of the commercial coin cleaners, protectants and dips, they can damage coins. If you place your coins in ziplock bags make sure there is a dessicant or drying agent in the bags, because the ziplock bag will trap moisture inside the bag and the inside of the bag is suceptable to condensation when there are changes in temperature. Moisture, light and sudden changes in temperature can be harmful to coins.</p><p>&nbsp;</p><p>PVC is easily cured in most cases with a dip in acetone and a rinse in distilled water. Verdigris is harder to eliminate and in most cases has damaged the surface of the coin.</p><p>&nbsp;</p><p>Some people try to scrape the verdigris from the coin with a toothpick (ouch) or with a q-tip dipped in mineral oil or olive oil, followed by a rinse or soak in distilled water. Some people soak coins in mineral oil or olive oil, followed by a rinse or soak in distilled water. Olive oil is mildly acidic and can lighten the coin. Never heard of coating a coin in vaseline....leaving any coating of oil or substance on a coin can ruin it over time, which is why people rinse or soak in distilled water. Personally I wouldn&#039;t attempt this with any coin of any value. If you must, practice on coins with very low value.</p><p>&nbsp;</p><p>General rule of thumb <b>dont mess with the coins</b> especially if they are valuable. There are professional coin restoration services out there, leave it to them. Even gently rubbing a coin with a microfiber cloth can create small scratches lowering the coins value.</p><p>&nbsp;</p><p>From the photo, it looks like verdigris on the reverse, not sure what is on the obverse, might be pvc.[/QUOTE]</p><p><br /></p>

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