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<p>[QUOTE=&quot;desertgem, post: 609660, member: 15199&quot;]The coin seems to be on the point of if something is not done, will eventually create irreversible damage. If it is acceptable to you in the current state, I agree with GD ( Doug) that containment storage should hold it in that condition for a long time. I personally ( and there may be disagreement) would do a quick rinse with acetone to remove any unseen organic material which might be a foci for corrosion, and then put into a holder of your choice that claims to inhibit corrosion.</p><p><br /></p><p>If it is not acceptable, you could either try to sell before it gets worse, or attempt a time/dilution dip with a solution to lighten it. The color is due to the depth of the sulfides or other chemical combinations , and by lessening the layer, the color will be lighter, but may be splotched or a coloring you won&#039;t like. A 1:5 or a 1:10 dilution of the dip solution with water will slow the reaction down significantly and allow you to observe the coloring along the way. Removing and rinsing when just a little darker than you want. You can always repeat if you determine it is still too dark. You have less chance of going the other direction.</p><p><br /></p><p>Now this means you have to be happy with the idea that it may fail what you want. Any artificial de-toning or toning is often unpredictable in outcome.</p><p><br /></p><p>By removing just&nbsp; some of the dark tone, might misrepresent the surfaces as being less damaged than&nbsp; they actually are. If you intend to keep the coin, this is not a problem. But if you do any chemical change, take photos!</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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