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<p>[QUOTE=&quot;BadThad, post: 1364017, member: 17261&quot;]No! Black is the final stage of sulfide toning. Read the book Coin Chemistry and you&#039;ll learn a lot about toning.</p><p><br /></p><p>Doug&#039;s explaination was kind of right. It&#039;s actually hydrogen sulfide that does the bulk of the work and it&#039;s what produces the multitude of colors. Metal surfaces quickly oxidize, in fact, right after being minted. The oxidative layer actually provides a layer of protection to the surface and is virtually invisible.[/QUOTE]</p><p><br /></p>

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