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<p>[QUOTE=&quot;Clutchy, post: 2091850, member: 45040&quot;]I didnt know that! I know purifying aluminum isnt a easy task, because welding it is an art in itself. If you dont have all your settings/technique right, it simply does not work.</p><p><br /></p><p>And I never seen a tin percentage or a reason for adding it. But that makes sense for it to brighten up the coin. I havent seen enough red UNC examples to see a difference between pre and post war. Every set of red unc collections Ive seen, no two coins looked identical side by side.[/QUOTE]</p><p><br /></p>

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