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<p>[QUOTE=&quot;-jeffB, post: 8459779, member: 27832&quot;]Interesting. Can you post a couple of photos of the blue coins next to normal white ones? It&#039;s always hard to judge color from photos without a reference.</p><p><br /></p><p>Lots of copper and nickel compounds are bright or deep blue, and there are ammonia complexes that are even more strongly colored. If you have lots of these and wouldn&#039;t mind sacrificing one or two, it would be interesting to dip one <i>briefly</i> in white vinegar (then rinse promptly) and see if the color disappears immediately. Actually, before even trying that, try soaking one in water and see if it comes off.</p><p><br /></p><p>Or if you want to keep them the way they are, that&#039;s probably even better. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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