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<p>[QUOTE=&quot;jolumoga, post: 26821839, member: 41780&quot;]Oh my! This topic actually goes deep because it involves chemistry. So, yes, one would expect a Peace dollar that is 100 years old to stabilize, but in practice that&#039;s not what happens. The toning is a protective coating, and when it is stripped out from chemical dipping (as is commonly done), you remove some of the surface metal and perhaps make the milk spots more visible - and the microscopic contaminant within the metal potentially more prone to reaction with the environment. I&#039;m just throwing this curve ball because I have wondered if there could be a chain of events involving both chemical contamination at the mint and generally accepted preservation techniques that inadvertently make the milk spots more visible. I believe these spots are almost always on lustrous uncirculated coins. Now maybe I am talking out of my you-know-what as a non-chemist, but ChatGPT just told me this is possible. Anyway, this is getting a bit theoretical.[/QUOTE]</p><p><br /></p>

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