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<p>[QUOTE=&quot;-jeffB, post: 2130438, member: 27832&quot;]I&#039;ll admit that I don&#039;t know much about XRF and other high-tech surface analysis techniques, but surely <i>someone</i> has turned some state-of-the-art tools on these spots. If they really are the result of chemical contamination, it shouldn&#039;t be <i>that</i> challenging to figure out what chemical components are there. That would be a good starting point for figuring out how they come into being, if not how to get rid of them.</p><p><br /></p><p>I really wish my friend were still working in a material science lab. I know she would&#039;ve been up for some after-hours tinkering. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie3" alt=":(" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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