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<p>[QUOTE=&quot;PyrotekNX, post: 94304, member: 3918&quot;]It doesn&#039;t matter how lightly a coin is cleaned, it&#039;s still cleaned.&nbsp; Microscopic particles of a coin are removed by any cleaning method.</p><p><br /></p><p>The top layers of a coin oxidize away and can never be replaced, it&#039;s best to keep a coin clean and tarnish free.&nbsp; The longer it sits and corrodes; the more damage will be done.</p><p><br /></p><p>A professional grader knows what a cleaned coin looks like and they have more experience detecting alterations than an ameteur collector would.</p><p><br /></p><p>Most graders will not slab a coin with verde gris and active PVC.&nbsp; They also usually will not grade a harshly cleaned coin.</p><p><br /></p><p>There are a few cases where cleaning is beneficial.&nbsp; PVC and active corrosion will eventually completely destroy the coin.&nbsp; Only use cleaning methods that offer the best trade between conservation and causing further damage.</p><p><br /></p><p>Pitted coins should to be protected after they have been conserved.&nbsp; A wax like Renaissance Wax (Ren Wax) is best to fill in the pores of the metal which will protect it from further corrosion.</p><p><br /></p><p>Museums use Ren Wax to protect their metal antiques, it works great on ancient coins.</p><p>&nbsp;</p><p>Raw copper, bronze, brass and steel would eventually corrode away to nothing without being coated and stored in a cool and dry area.&nbsp; Even the oils from your skin will cause corrosion.</p><p><br /></p><p>Part of the duties of curating a coin collection include protecting your investment.&nbsp; All coins in a collection should be properly maintained and stored.&nbsp; Even though some of your coins have very little to no intrinisic value today, they will eventually if they are well kept.</p><p><br /></p><p>Collectors 100 or more years ago put coins away as an investment.&nbsp; The only reason why these coins still exist today,&nbsp; is because someone was thoughtful enough to put them away when they were new and were only worth face value.</p><p><br /></p><p>In rare cases a coin will be lost and recovered like in a shipwreck or ground burial.&nbsp; The high grade coins only come from oldtime collections.[/QUOTE]</p><p><br /></p>

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