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<p>[QUOTE=&quot;Lehigh96, post: 486731, member: 15309&quot;]You have that the wrong way around.&nbsp; Tarnish (corrosion) is bad for engineering materials (steel etc) as they hold things together.&nbsp; A bridge falling apart from corrosion is baaaaad.&nbsp; Toning on coins, which can only be viewed and admired, makes them beautiful and unique.[/QUOTE]</p><p><br /></p>

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