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<p>[QUOTE=&quot;Collector1966, post: 1197789, member: 17919&quot;]The only time I ever tried to give a coin artificial toning was when I was a teenager and I bought an AU 1917 SL quarter from the local coin shop. After learning about the effects of sulfur on silver in chemistry class, I covered the coin in an egg yolk paste and kept it for about a week in the refrigerator. Then I took the coin back to the shop to show the owner my creation. She had a fit, and ended up giving me a 15-minute lecture about how I&#039;d ruined the coin! Her reaction rattled me so much that I have never attempted artificial toning since then!</p><p><br /></p><p>The house I lived in from 1993-1996 was a place in Japan that was probably built in the &#039;80s or earlier with cheapie building materials. The sulfur content was so high that nearly anything made of silver that was left out in the open started to tarnish within a few days. My current residence apparently has a far lower sulfur content, as I can leave silver out in the open for weeks with no noticeable chemical reaction.</p><p><br /></p><p>As for my coin grading, I doubt PCGS would give it a grade since it appeared to have been cleaned when I bought it.[/QUOTE]</p><p><br /></p>

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