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<p>[QUOTE=&quot;Insider, post: 2429835, member: 24314&quot;]I agree, the stuff on the letters looks like gunk that can be removed; yet possibly leaving a stained surface.&nbsp; There are other spots formed from corrosion.&nbsp; A good way to tell is to look closely at the spots next to the &quot;5&quot;&nbsp; and on the &quot;A.&quot;&nbsp; You should see a tiny, raised, black lump in the center.&nbsp; That is the foreign matter or more likely the corrosion &quot;debris&quot; coming up from the coins surface.&nbsp; The &quot;black&quot; color around the lumps is call the &quot;reaction ring&quot; of discoloration that often accompanies these lumps.[/QUOTE]</p><p><br /></p>

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