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Do silver coins inside NGC slabs tone?
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<p>[QUOTE="Suarez, post: 3713433, member: 99239"]That's probably true Jeff. I didn't consider the possibility of intentionally trying to tone a silver coin inside a slab but there's probably several ways of doing it.</p><p><br /></p><p>Just thinking off the top of my head, one way might be to gently heat the slab next to hot brine. The coin, being metal, expands as it's being heated drawing in the brine vapors which bring with it trace amounts of iodine, chlorine and bromine which in turn create photosensitive salts. Light darkens these and creates the rainbow effect depending on the local depth of these compounds (varying depths absorbing and reflecting light at different wavelenghts).</p><p><br /></p><p>Again, just taking a mental shot at this.... I have no slabs to experiment on <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Rasiel[/QUOTE]</p><p><br /></p>
[QUOTE="Suarez, post: 3713433, member: 99239"]That's probably true Jeff. I didn't consider the possibility of intentionally trying to tone a silver coin inside a slab but there's probably several ways of doing it. Just thinking off the top of my head, one way might be to gently heat the slab next to hot brine. The coin, being metal, expands as it's being heated drawing in the brine vapors which bring with it trace amounts of iodine, chlorine and bromine which in turn create photosensitive salts. Light darkens these and creates the rainbow effect depending on the local depth of these compounds (varying depths absorbing and reflecting light at different wavelenghts). Again, just taking a mental shot at this.... I have no slabs to experiment on :-) Rasiel[/QUOTE]
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Do silver coins inside NGC slabs tone?
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