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<p>[QUOTE=&quot;Argenteus Fossil, post: 1983252, member: 71478&quot;]If they have a thick plating then the only metal touching the acid is the gold and would test right assuming it&#039;s plated with real gold. The only true way to acid test would be to put a deep scratch in the coin and put the acid on the scratch. If not pure gold all the way down the acid will bubble or turn colors (such as green if copper is present). Of course even if the coin tests right it is ruined beyond to the point of melt value. That&#039;s why it is almost a last resort. I would see about taking it somewhere to get it tested with a laser to read it&#039;s internal properties without damage.[/QUOTE]</p><p><br /></p>

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