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<p>[QUOTE=&quot;Coins4Eli, post: 24885417, member: 150554&quot;]WARNING - DO NOT ATTEMPT TO DO ANYTHING LISTED BELOW. </p><p>YOU WILL RUIN YOUR COINS. I HAVE GONE THROUGH TRIAL AND ERROR FOR MORE THAN A YEAR BEFORE I GOT GOOD RESULTS. </p><p><br /></p><p>I have come across many a large cent with heavy raised corrosion, I have created a method to remove this. My friend who is a chemist helped me with formulating a strong chemical that eats away at the impurities on copper, but does not affect the copper itself. This chemical dissolves all of the dirt and any corrosion on the coin. Because the early dates (1793-1814) are made of almost 100% pure copper the chemical does not eat into the surfaces, aside from the top oxidised layer containing impurities. After the chemical has been applied and removed I am left with an even mat pink coin, the areas where corrosion once was are now clean and the same color as other parts of the piece. Then I go through the 6 month process of NATURALLY retoning the coin. During the retoneing stage it is crucial to rub the piece occasionally to get contrast from high to low points. This simulates the way a coin would naturally tone. After retoning is finished and the coin has a good circulated contrast I brush the piece with blue ribbon. The result is a natural even light to dark brown piece, matching perfectly with other original coins in my collection. I have had good results with this method, and even had a piece straight grade with NGC. I will post some before and after pictures when I get home.&nbsp; </p><p><br /></p><p>I personally consider this to be conservation, as these coins are on track to deteriorate into nothing if the corrosion is not stopped.[/QUOTE]</p><p><br /></p>

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