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<p>[QUOTE=&quot;jtlee321, post: 2929912, member: 73983&quot;]I would agree with this.&nbsp; My first thought is if it was ink acetone would have removed it.&nbsp; Since it did not, I then thought of it as looking like slag that was mixed into the alloy.&nbsp; Slag is the impurities that rise to the surface during the refining process.&nbsp; Not all of it gets separated and some can remain behind.&nbsp; Because gold has a higher specific gravity than the other impurities the slag appears on the surface of the coin.&nbsp; It&#039;s found in silver coins as well.[/QUOTE]</p><p><br /></p>

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