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<p>[QUOTE=&quot;HawkeEye, post: 2727227, member: 86305&quot;][ATTACH=full]619293[/ATTACH] I cannot take credit for this because I am not a chemist and certainly know less about the topic than someone like Doug Kurz.&nbsp; Doug is the one that put together the Sunnywood Collection and developed a lot of knowledge he shared.&nbsp; His collection of monster toned coins may still be up on PCGS and if so it is certainly worth a few minutes to review.</p><p><br /></p><p>As the silver reacts with its surroundings it develops a thin film of color that starts out as a light gold and then progresses to black.&nbsp; This chart has helped me a lot understand the stage of toning and how much the coin has reacted to various reagents.&nbsp; Black may be good for your tuxedo, but not for coin toning.[/QUOTE]</p><p><br /></p>

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