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<p>[QUOTE=&quot;R_rabbit, post: 3569715, member: 101793&quot;]<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Here we go ,</p><p>The occurrence happens most often with sulfur or oxygen. As that reaction occurs, a compound forms on the surface of the coin, gradually changing the color of the metal. The color change is a gradual process that typically takes years to fully develop.[/QUOTE]</p><p><br /></p>

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