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<p>[QUOTE=&quot;NSP, post: 3218388, member: 74849&quot;]Here’s a poorly centered picture of one of my favorite terminally toned coins. While this type of toning would be environmental damage on an UNC coin every day of the week, it makes low grade coins look very nice.</p><p><br /></p><p>[ATTACH=full]837333[/ATTACH] </p><p><br /></p><p><br /></p><p><br /></p><p>Back when you initially posted this I wondered if I’d learn about this sort of thing in my high temperature corrosion class. We haven’t covered hot sulfur corrosion in depth yet, but basically sulfur wreaks havoc in protective scales. A similar thing happens to turbine blades in jet engines when they fly through a cloud of volcanic ash.[/QUOTE]</p><p><br /></p>

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