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<p>[QUOTE=&quot;Marshall, post: 8130463, member: 21705&quot;]Different elements react to different things. Rust is usually an oxidation of Iron and can be either brown or green. </p><p><br /></p><p>Copper usually turns red or green as it oxidized and is usually called verdigris. It will ultimately turn black and conserved&nbsp; corroded coins will often be left with black inactive damage. </p><p><br /></p><p>Toning is just the initial stage of&nbsp; either corrosion or patina, depending on whether it leads to a protective coating or continuous destruction.</p><p><br /></p><p>Silver resists corrosion, but metal in the alloys less so. Same with Gold though it&#039;s is even more resistant than silver.</p><p><br /></p><p>The color on my screen appears to be from Iron and should not be causing damage to the coin chemically. However, the rust could have formed a crust which will affect the luster when removed.</p><p><br /></p><p>In any event, wishing the coin wasn&#039;t damaged if it has been shouldn&#039;t prevent you from attempting to conserve it now to mitigate additional damage.</p><p><br /></p><p>You seem to be on a good path.[/QUOTE]</p><p><br /></p>

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