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<p>[QUOTE=&quot;iPen, post: 2398119, member: 69760&quot;]But it produces patina, at least on silver... I&#039;ve experimented with it myself to test the scenario of AT/NT and intentional/unintentional. There&#039;s a dark goldish color that turns into a dark purple color the longer you wait. I&#039;ve concluded that you&#039;ll need a high enough concentration of sulfur (e.g. crushed hard boiled egg in a small container). It won&#039;t look like most NT coins, but if someone were to accidentally leave it in a sulfuric environment without any intention of toning, one cannot rule out NT.[/QUOTE]</p><p><br /></p>

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