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<p>[QUOTE=&quot;desertgem, post: 2197358, member: 15199&quot;]H<font size="2">2<font size="4">S&nbsp;&nbsp; is hydrogen sulfide.&nbsp; Sulfides are one of the main radicals that produce colors beyond the &#039;silver&#039; color of silver. They are found in the atmosphere in different proportions depending on the environmental contamination ( such as in coal or petroleum powered ) areas.&nbsp; So only the poster knows if he was suggesting it was toned by artificial means ( not proper for grading) or as a straight statement which is usually true, although if continued, will damage and pit the coin significantly ( Black)</font></font>[/QUOTE]</p><p><br /></p>

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