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<p>[QUOTE=&quot;lordmarcovan, post: 3123398, member: 10461&quot;]Well, there&#039;s certainly a fingerprint <i>pattern</i> on the K-Rand in the first picture, though I&#039;m not sure what the contaminant on the surface is.&nbsp; </p><p><br /></p><p>This next is gonna sound strange, but have you heard of <a href="https://dps.mn.gov/divisions/bca/bca-divisions/forensic-science/Pages/forensic-programs-crime-scene-superglue.aspx" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://dps.mn.gov/divisions/bca/bca-divisions/forensic-science/Pages/forensic-programs-crime-scene-superglue.aspx" rel="nofollow">cyanoacrylate fuming?</a>&nbsp; It&#039;s often called &quot;Superglue fuming&quot; and is used as a forensic method for detecting latent fingerprints.</p><p><br /></p><p>Those prints almost look like that.&nbsp; Mind you, I&#039;m not suggesting they <i>are</i> residue of cyanoacrylate fuming - merely that they <i>look</i> like that.&nbsp; I know next to nothing of the process.</p><p><br /></p><p>Frankly, I&#039;m surprised that acetone did not remove the prints.&nbsp; Would acetone remove cyanoacrylate glue?&nbsp; Is my whole discussion of cyanoacrylate a red herring?&nbsp; Maybe.</p><p><br /></p><p>Anyway, there must surely be some kind of solvent that could remove that, but I don&#039;t know what to recommend.</p><p><br /></p><p>Are you keeping these as bullion?[/QUOTE]</p><p><br /></p>

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