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<p>[QUOTE=&quot;gxseries, post: 204285, member: 4373&quot;]Sorry but appearently you are demonstrating the biggest sign of ignorance. If your method of cleaning is so 100% efficient, your idea would be in the conservation department but it isn&#039;t ever since coins were invented.&nbsp; </p><p><br /></p><p>If you think your fingers wouldn&#039;t damage silver coins, think twice. If you know Mohs&#039; scale, that&#039;s great. Calc is at 1 and diamond, we should all know is the hardest is at 10. Fingernails have Mohs hardness scale of 3, pure silver at 2.5. Wow, fingernail CAN scratch silver coins!!!!!!!!!!!!!! (yes, you can scratch PURE silver coins) Now you know why silver is usually alloyed. To top it up, it can be possible that under your fingernail that you have traces of quartz, i.e. sand traces etc, and hardness of quartz is around 6-7. Ouch. </p><p><br /></p><p>Turpentine is NEVER a good idea as it&#039;s a product from pine trees or maded from dilstilled petroleum if I&#039;m not mistaken. It is under a group of hydrocarbons and that&#039;s like pouring gasoline on your coins. YOU KNOW IT SMELLS! Primary use of turpentine is a paint stripper so it&#039;s obviously not recommanded to use turpentine on coins. </p><p><br /></p><p>On the other hand, acetone is not a hydrocarbon group but proponal group. BIG difference there. </p><p><br /></p><p>Finally, please kindly explain how any of your methods are NOT going to hurt proof coins. Remember, all you need is a tiny grain of quartz to ruin your coins or a wrong type of chemical to ruin them forever.[/QUOTE]</p><p><br /></p>

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