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<p>[QUOTE=&quot;Oldhoopster, post: 8139539, member: 84179&quot;]According to science, gold does not tone.&nbsp; However, gold alloys used to make coins could tone.&nbsp; </p><p><br /></p><p>I&#039;m not discounting your observations, but couldn&#039;t the residue come from previous&nbsp; incomplete removal or cross contamination from handling?&nbsp; </p><p><br /></p><p>Based on [USER=33176]@Kentucky[/USER] career as a PhD chemist, I tend to trust his answer about the the plasticizer decomposition products being viscous. That also matches my observations.&nbsp; As I said previously, I&#039;ll have to agree to disagree on this.&nbsp; If the observations don&#039;t match the science, especially in an uncontrolled environment, it&#039;s usually the observation that needs refined, not the science that&#039;s wrong.[/QUOTE]</p><p><br /></p>

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