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<p>[QUOTE=&quot;mlov43, post: 2992230, member: 16729&quot;]I&#039;m already a millionaire <font size="2">(in South Korean <i>won</i>)</font>, so I&#039;m good.</p><p><br /></p><p>I really would like to think that there&#039;s a solution, but I suspect there isn&#039;t going to be a fix for a lot of brown-spotted coins.</p><p><br /></p><p>I&#039;m a collector of South Korean copper-based coins, and their particular alloy is either 88% Copper, 12% zinc (known in metals industry as &quot;commercial bronze&quot;) or 65% copper and 35% zinc (also known as &quot;high brass&quot;).&nbsp; I could swear, these coins have THE HIGHEST susceptibility to brown spotting of pretty much any coins ever minted!&nbsp; Get the storage of these coins just a little wrong, and you can expose them to the kind of atmospheric conditions or temperature swings to which these alloys are particularly susceptible.[/QUOTE]</p><p><br /></p>

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