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<p>[QUOTE=&quot;GDJMSP, post: 174085, member: 112&quot;]Yup, that&#039;s because by then the oxidation has usually eaten into the coins surface. There really are only two choices on what to do. First and foremost is to remove the coins from the environment that created the toning, properly holder &amp; store them. This should stop any additional oxidation but it won&#039;t change anything that has already been done.</p><p><br /></p><p>The other choice is to dip the coins, not in acetone because that won&#039;t do a thing, but to dip them in a commercial dip that will remove heavy toning. That will also remove a small amount of metal from the surface of the coin and leave dull and washed out looking. And unless the coin is properly stored afterwards the toning will probably start to return and damage the coin even more. But if it is properly stored, then the coin should remain just the way it was after dipping.</p><p><br /></p><p>A word of warning if you choose to dip them - start with a coin of low value and dip it quickly, just in and out. Then dip it in acetone to neutralize the dip, then dip it a couple times in distilled water. Then examine the coin and see what ya think. If your happy quit - if not repeat the proceedure until you are. </p><p><br /></p><p>But bear in mind - coin dips are an acid. That&#039;s why they do what they do. And if you over-do it you&#039;ll end up with a chunk of bullion.[/QUOTE]</p><p><br /></p>

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