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"Great book and very informative although he pretty much, categoricically states that all toning is damage w/o giving much latitude on the subject. (Which, technically he's right) \n  \n  \n\nI resurrected the below thread called:  Great Website, TomB!  posted a couple of years ago. Tom is a chemist and a knowledgable numismatist who created a website concerning toning. Lots of good info there and on the thread. Check it out: \n  \n\n Old post reposted by a host with the most boast to toast or sumpting like that.  "
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