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<p>[QUOTE=&quot;Lehigh96, post: 447393, member: 15309&quot;]Toning is the formation of an oxide layer on the surface of the metal which is the first step of corrosion.&nbsp; Dipping a toned coin completely removes the oxide layer.&nbsp; Now I ask, which one does more damage?</p><p><br /></p><p>Ruben, you seem to think that the corrosion once started will spread like a disease.&nbsp; If you remove the coin from the toning source (sulfur), the corrosion process stops completely.&nbsp; The sulfur atoms in the silver sulfide layer do not have the ability to multiply and propagate the corrosion.</p><p><br /></p><p>If you take a rainbow toned coin, slab it, and store it correctly, the coin will retain the present appearance indefinitely.[/QUOTE]</p><p><br /></p>

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