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<p>[QUOTE=&quot;physics-fan3.14, post: 3604700, member: 19165&quot;]That largely depends on what was used to create the artificial toning. Some AT methods do create the same silver sulfide reaction, albeit at an accelerated pace or with unusual air or fluid flow patterns (hence the splotchy appearance some AT coins have). Some AT methods just leave a film on the surface which can be removed. However, some AT methods use chemicals which interact with the surface in a different way than the silver sulfide. These may etch into the surface, or may stain the surface deep enough that a dip won&#039;t remove the evidence. There are many ways to AT a coin, and I don&#039;t know which one was used here - some of them can be conserved to remove the AT, and some of them can&#039;t.[/QUOTE]</p><p><br /></p>

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