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<p>[QUOTE=&quot;moreotherstuff, post: 319062, member: 56&quot;]You&#039;re not cleaning copper.&nbsp; You can only clean the glass.&nbsp; Don&#039;t spray cleaner directly onto glass; apply it to whatever you&#039;re using to clean so the liquid doesn&#039;t get out of control.</p><p><br /></p><p>I&#039;ve read that silver isn&#039;t used on modern mirror, but it was in the past, and given the opportunity, silver will tarnish.&nbsp; That&#039;s what black edge is about.</p><p><br /></p><p>When silver was used, some commercial process followed the silver application with a coating of copper.&nbsp; This has to do with a metallurgical phenomenon called &quot;the nobility of metals&quot;.&nbsp; Silver is more noble than copper, which means that when the two come into contact in an oxidizing situation, the copper will &quot;sacrifice&quot; itself to preserve the silver.&nbsp; </p><p><br /></p><p>You won&#039;t see the copper.&nbsp; It&#039;s applied to the back of the mirror under the paint - a layer between the silver and the paint.&nbsp; It enhances the durability of the silver - keeps it brighter, longer.</p><p><br /></p><p>The same principle applies to galvanized metal where a zinc coating will deteriorate before the underlying steel starts to rust, or on something like a chromed steel bumper where the steel will rust while the chrome plating stays relatively intact.[/QUOTE]</p><p><br /></p>

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