Learning to tell artificial toning is getting harder these days. But the best resource I ever had on this subject came from Robert "Bob" Campbell's
ANA Summer Seminar bull session about it. There is a video of his presentation available through CoinTV David Lisot's company in Texas.
How to Detect Artificial Toning
Robert Campbell
The coin doctors are hard at work to deceive you with beautifully colored coins. Learn all about toning from Robert Campbell,
ANA authenticator and Regional Coordinator. He explains what toning is and how to tell natural from artificial. Lecture with slides.
Length: 45 min.
Catalog #ANA94-001
Price: $24.95
http://coinvideo.com/search.php?sca...ey=~Grading~So many coins were dipped in the 1960-1980's as white coins seemed to bring better money, it's almost hard to believe that many of them are original today, many have since re-toned naturally (alibit, processed though storage methods) but not in a malicious way, so they may indeed be okay at a
TPG.
The best advice I can tell you from Bob's talk is to look for a rainbow spectrum spread, that is the colors must follow the order of a rainbow, from deep purple/violet, through to the reds, any variation in this is most certainly artificially done. Also look for the way the toning flows over higher parts of the coin, broken areas, and weird color patterns.
This article (while lengthy) is a pretty start.
http://coinsguide.reidgold.com/toning.html" target="_blank" rel="nofollow"> br /
http://coinsguide.reidgold.com/toning.htmlI really recommend you order the DVD from David, it is worth every penny, and could potentially save you from making big money mistakes down the road, if you are into buying toned coins.

"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013!
ANA Life Member #3288 in good standing since 1981, ANS, Early American Coppers Member (EAC), Colonial Coin Collectors Club member (C4), Conder Token Collector Club member (CTCC), Civil War Token Society (CWTS) member, Liberty Seated Collectors Club (LSCC) & Numismatic Bibliomania Society member (NBS), USMex, Member in good standing, 2¢ variety collector.
See my want page:
http://goccf.com/t/140440
Edited by westcoin
12/16/2015 02:06 am