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<p>[QUOTE=&quot;Eduard, post: 1587406, member: 8959&quot;]Thank for posting those pictures, derrick. </p><p><br /></p><p>From the looks of it you are close to the Cordillera de los Andes? Reminds me a lot of one of the places where my father worked - a sulphur mine perched up 4200 m above sea level, close the to the Bolivian border. Yes, it does not get any lonelier than that.</p><p><br /></p><p>Regarding you coin, the 1907 is a scarce year with only a few thousand minted, so at this stage I would not touch it. However, acetone does effectively remove organic junk which is soluble in it, and will not damage silver. I said silver, mind you, not copper. I have used it many times on very scarce coins, and if you do it properly, no issue.&nbsp; </p><p>You need to use lab grade acetone (dry). Get some experience with low value coins first. Soak the coin in a glass or polyethylene container (about 50 ml will do) and soak for a few hours. </p><p><br /></p><p>I have soaked some coins in acetone for 24 hours w/o problems. Remove, rinse with new acetone and let dry on its own. Do not at any stage rub or dry with a cloth. The acetone, being more polar than most organic solvents, will only remove matter which is soluble in it. It will not attack the silver. Again, try it first with low value coins, and get some experience.&nbsp; &nbsp; </p><p><br /></p><p>PS- I hope they pay you well to work where you work![/QUOTE]</p><p><br /></p>

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