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<p>[QUOTE=&quot;NorthKorea, post: 2566138, member: 29643&quot;]Greg, if you&#039;re a chemist, why did you make no mention of ambient temperature, air pressure (altitude) or humidity? Also, how often have you successfully submitted a coin after the 1% bath of trisodium hydrogendicarbonate? I would assume that if you&#039;re leaving the coin in the solution long enough to get past the outer most layer of verdigris, then you&#039;d again be dealing with loss of patination. I dunno. I&#039;m lazy, and I like Thad&#039;s product: I drop a little on the spot and tilt the coin until the bubble flows over all the devices and fields, turn the coin upside down on a very soft cloth and repeat. Flip over again, then let dry 24 hrs. Verdigris stopped. I guess if I wanted to remove the stuff, I could always poke at it, but my main goal is stopping the process, since I live in a hot, high humidity environment with high sulfur volumes in the air.[/QUOTE]</p><p><br /></p>

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