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<p>[QUOTE=&quot;Tom B, post: 1890445, member: 11854&quot;]I am writing about a compound that is a mixture of potassium sulfide, potassium thiosulfate and potassium bisulfide.&nbsp; It creates a light gold through deep purple color depending upon its strength and length of exposure.&nbsp; In my experience, CBHs are the most commonly worked on coins using this method.&nbsp; Lighter usage can result in getting a coin certified while stronger applications are generally kicked back as AT.[/QUOTE]</p><p><br /></p>

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