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<p>[QUOTE=&quot;satootoko, post: 124630, member: 669&quot;]From the coloration of the pictures, I assume we&#039;re talking about silver.&nbsp; If so, PVC is the most logical suspect.&nbsp; If the coin is copper or one of its alloys (brass, bronze, etc.), verdigris would be the main suspect.For PVC the accepted treatment is a dip in pure acetone (<i>not</i> nail polish remover with fragrences and other additives), followed by a quick rinse in distilled or deionized water, and air drying on a soft cloth.</p><p><br /></p><p>Far and away the best method for removing verdigris from your collection is disposing of the coin. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Both PVC residue and verdigris can cause pitting of the surface, such as what appears where the arrow is pointing:[/QUOTE]</p><p><br /></p>

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