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<p>[QUOTE=&quot;coinsleuth, post: 8358878, member: 75667&quot;]I have seen heavy dark toning once before when silver came in contact with concentrated hydrogen sulfide for an extended period of time.&nbsp; In the case I recall, the dark toning did diminish to a softer shadow type color with the use of acetone.&nbsp; I believe the only solvent that will remove the tarnish without altering the coin is benzene, but obtaining benzene would be difficult, and benzene must be handled with extreme care.[/QUOTE]</p><p><br /></p>

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