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<p>[QUOTE=&quot;Colonialjohn, post: 2133884, member: 57741&quot;]BAJJERFAN - the sodium is not important its just the chloride and sulfur reacting with the silver. Like I told desert gem its round and round with some unknown variables since the step by step mfg. process is unknown. In any case I will post a coin I recently posted to another chat room of a SEM/EDS spectrograph. It will show alot but Material Analysis takes time to learn and often confuses most newcomers. Yes the White book - Coin Chemistry. His focus was primarily at sulfur and showing sulfur compounds are the primary culprit of toning - in his mind toning is PMD ... I am convinced these milk spots are AgCl based on previous data and its probably PMD - atmospheric induced phenomenon (i.e., sulfur and chloride) after the pieces leave the mint. Hopefully my new book in 2017 will help alot of people appreciate Material Analysis more with coins as did the Metallurgy in Numismatics series did awhile back ...</p><p>&nbsp;</p><p>Tonight with some coin &amp; SEM/EDS photos ... stay tuned. We can then argue ... LOL. </p><p>&nbsp;</p><p>JPL[/QUOTE]</p><p><br /></p>

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