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<p>[QUOTE=&quot;LostDutchman, post: 2024358, member: 16994&quot;]I was watching The Curse of Oak Island the other day and they took a coin that hey had found to a &quot;treasure expert&quot;. They proceeded to show him cleaning the oxidation off the coin with citric acid. See clip below:</p><p><br /></p><p>[MEDIA=youtube]h3IP30bPMns[/MEDIA]</p><p><br /></p><p>This got me thinking... If this guy works for a treasure salvage company, what does he know about citric acid and coins that I don&#039;t know?? So I decided to try some experiments.</p><p><br /></p><p>When it comes to treasure salvaged coins and &quot;conservation&quot; there is a different ballpark of what is acceptable. Often these treasure coins have been exposed to prolonged periods in a saltwater environment and without harsher forms of cleaning they would eventually disintegrate.</p><p><br /></p><p>I had a 1907 Philippine one silver peso that had a spot of oxidation on the wing... this is most likely a result of exposure to seawater. I mixed a light solution of citric acid and dropped the coin in. You can see that the oxidation on the silver is the only thing the acid is touching and is not effecting the clean silver at all.</p><p><br /></p><p><br /></p><p>[ATTACH=full]367172[/ATTACH]</p><p><br /></p><p>I&#039;m doing some further experimentation I&#039;ll report here what I find.</p><p><br /></p><p><b><span style="color: #ff0000">I DON&#039;T RECOMMEND EXPOSING ANY OF YOUR COINS TO ACID. DON&#039;T DO IT!</span></b>[/QUOTE]</p><p><br /></p>

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