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<p>[QUOTE=&quot;robinjojo, post: 8578582, member: 110226&quot;]I see.&nbsp; Actually I&#039;ve seen this before with Libertads, but have not examined them closely.&nbsp; If the problem with due to a chemical reaction that has actually etched into the surface of the coin, then removal seem quite problematic, especially with a proof coin.</p><p><br /></p><p>I don&#039;t know if the Sodium Thiosulphate will help, but as I suggested you might try to experiment with a low value coin that has the milky spot problem, if you have one.[/QUOTE]</p><p><br /></p>

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