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<p>[QUOTE=&quot;yakpoo, post: 1254704, member: 18157&quot;]I would agree that vinegar and/or baking soda will make a mess of copper and clad coins, but I&#039;ve used it very effectively on 90% silver coins; <b>coins that subsequently received very high grades from both NGC and PCGS. </b>I experiment quite a bit with coin cleaning (on crappy coins)...somethings work, but most don&#039;t.</p><p><br /></p><p>Here&#039;s what I do for <b>uncirculated </b>silver coins...</p><p><br /></p><p>I fold a paper towel and put it in the bottom of a cereal bowl. I fill the bowl about halfway with boiling distilled water and add a couple of tablespoons of white wine vinegar. I place the coin in the solution and wait about an hour...til it cools down. I run my finger gently over the surface of the coin on both sides to ensure a uniform coating of the vinegar solution. I then add about a teaspoon of baking soda to the solution...just enough so it all reacts (foams) with the vinegar and there&#039;s no residual precipitate. I again gently run my fingers over the surface of the coin. The crud (and the toning) just wipes away. I rinse with distilled water and Presto Change-o, a brilliant silver coin with beautiful mint luster. I&#039;ve tried this a variety of ways and nothing else seems to work.</p><p><br /></p><p><b>I&#039;m not suggesting that anyone try this without first experimenting on scrap coins (I wouldn&#039;t/didn&#039;t)</b>...but that&#039;s not to say you should be afraid to experiment. Always keep in mind that you may destroy the numismatic value of the coin if you make a mistake.[/QUOTE]</p><p><br /></p>

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