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<p>[QUOTE=&quot;rhoggman, post: 392421, member: 13987&quot;]Is luster ever really gone then, or just hidden? Gold is a lustrous metal, and with the exception of sodium chloride, or bromides I do not know what would actually effect gold. </p><p>Since most gold coins are alloyed with copper, I guess the &quot;tarnished&quot; look is really from the deposition of metallic ions (mainly iron). So according to you these &quot;detergents&quot; only remove particles exposing what already exits?</p><p><br /></p><p>I think you are right about the Q-tip; however, I think you would have to go a little overboard on the elbow grease to scratch even a gold coin with a Q-tip. MS 70 almost feels like a lubricant which also diminishes this risk IMO. </p><p><br /></p><p>FYI I am not suggesting the use of MS 70 to anyone, but as for me I would use it before dipping. I have heard from GDJMSP and others that heavy tarnish is much more difficult to remove with MS 70.[/QUOTE]</p><p><br /></p>

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