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<p>[QUOTE=&quot;Boss, post: 458556, member: 15110&quot;]Speedy, I am sorry I don&#039;t agree with this stance. Cleaning and conservation are not the same thing. Dips which remove layers of metal ions do change or alter the surface and that is a form of chemical &quot;cleaning&quot;, however some coins are so ugly this ends up being the best solution if done by someone who has educated themself and practiced on a lot of common coins first. Olive oil is slightly acidic and will darken the coin in time. Mineral oil will do nothing to chemically harm any coin (don&#039;t put proof or PL coins in as this will blurr their finish). These substance can be removed with acetone, however, I usually use acetone first to remove any possible finger prints and then soak in mineral oil for extended periods based on the amount of grime or verdigris. Experienced people, not novices, will use a rose thorn or toothpick to remove junk/grime on coins after a long soak in mineral or olive oil. Again practice on common, modern coins worth only their face value. I am saving up the money for a high tech binocual type microscope that feeds into my computer, almost like doing microsurgery for my coins with grime in between the dentils and letters, etc.. I have done this with good success using my 20 power loope but it is too difficult to hold the lupe and treat the coin at the same time. I have personally damaged a few coins I would have rather not so people who are INEXPERIENCED should not try such techniques. A valueable coin that has decreased eye appeal should be sent to NCS. I just sent 9 Indians and Lincolns to NCS and 6 of them graded at NGC after conservation. I am positive those six would not have graded without their conservation. This is ultimately the best solution for any coin that does look right to the owner. They only charge 1% to evaluate a coin. In my opinion any coin worth over $150-200 with the type of problems that they address is worth it. Simply go to the NCS website (Numismatic Conservation Services). This ISMHO[/QUOTE]</p><p><br /></p>

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