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<p>[QUOTE=&quot;Drusus, post: 335517, member: 6370&quot;]If it is developing a patina, which is corrosive, it will eat away the metal and leave the surface pitted. But again, when it comes to modern coins, I dont know what the best way would be. A patina on ancients is desired and if you clean them down to the metal you often find they are ALL patina, corroded right through...but to protect from bronze disease they might give a coin a coat of wax. Many ways to get it off and take the coin back to the metal...if thats what you want, ...if it is bright green and appears powdery it could be bronze disease?</p><p>&nbsp;</p><p>In ancients its taboo to remove a patina, in moderns, I assume you dont want it forming.</p><p>&nbsp;</p><p>Here is a good example of a coin eaten by corrosive verdigris then the patina is completely stripped by electrolysis or chemicals:</p><p>&nbsp;</p><p><img src="http://www.cachecoins.org/aurelian01.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p>&nbsp;</p><p>In my experience if there is just small amount of verdigris, there will be a pit in the metal under it.[/QUOTE]</p><p><br /></p>

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