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<p>[QUOTE=&quot;RichardT, post: 8521355, member: 100005&quot;]If the stuff was blue, like you said, then it was likely to be natural toning (aka tarnishing) of silver. Silver reacts with sulfur in the air, turning a variety of shades (blue, orange, brown) before turning black eventually.</p><p><br /></p><p>Sulfur is everywhere, partly due to combustion engines. Trying to prevent the blue stuff from appearing again would be very difficult, unless the coin is kept in an air-free environment somehow. Not practical I would say.</p><p><br /></p><p>Speaking generally, this toning tends to be desired on ancient coins. It proves that the coin has been out of the ground for some time.</p><p><br /></p><p>True verdigris is rock hard and can&#039;t be removed by acetone.[/QUOTE]</p><p><br /></p>

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