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<p>[QUOTE=&quot;BAJJERFAN, post: 2135210, member: 74330&quot;]I was hoping this thread might morph into a discussion/summation of what people have done to identify what the white spots are and hopefully to suggest ways the could be removed or at least what people have tried and any success they have had.</p><p><br /></p><p>All we seem to have is speculation with little or basis in fact. If salt spray was responsible, don&#039;t you think that crap would be all over everything at PCGS and not just a few select silver coins? Sheesh, if you know anything about chemistry you know that silver doesn&#039;t react with&nbsp; hydrochloric acid, much less reacting with saline. If it was simply deposited on the coins, it should just as simply wash off.</p><p><br /></p><p>It&#039;s been said that when the Mint started restriking silver dollar coins back in 1921, that they made a change in the way that they washed the planchets and included hydrochloric acid or replaced another washing agent with HCl. This was/is said the be largely responsible for the fact that year 1921 Morgans and all Peace dollars tone differently than Morgan dollars and that Peace dollars were plagued with spotting problems.</p><p><br /></p><p>The thing is that nobody knows exactly the entire process at any of the mints or the steps that could result in spotting. At one time I was in contact with the head QC person for the Mint. They were aware that chloride was the major culprit causing the spotting on silver eagles.</p><p><br /></p><p>It seems that unless it&#039;s been already done, a study of the spots on a variety of spotted coins should be done. Coins from mint tubes, various slabs, etc. look for a common contaminant or contaminants. I would suggest using ESCA aka XPS as a preferred tool.</p><p><br /></p><p>Seems like it could be a good thesis project for someone in chemistry or possibly metallurgy.[/QUOTE]</p><p><br /></p>

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