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All Forums Category: General Numismatic Forums Forum: Main Coin Forum

Question About Toning Of Nickel-Brass Coins

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Archraz
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 Posted 03/23/2010  6:23 pm Show Profile   Bookmark this topic Add Archraz to your friends list Get a Link to this Message Number of Subscribers
I have noticed that a lot of nickel-brass coins, such as those of Jamaica and British West Africa, suffer from very oddly colored spotting & staining. What causes this? Is it merely indicative of corrosion caused by moisture and/or chemical in soil or is this composition just really prone to red and grayish spots?

P. S. How would you grade my 2 Shillings of British West Africa that suffers from this very condition? Thanks!



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JimR
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 Posted 03/23/2010  8:01 pm  Show Profile   Bookmark this reply Add JimR to your friends list Get a Link to this Reply
Just speculation but I wonder if the unique color has to do with the tropical climate.
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Archraz
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 Posted 03/23/2010  9:00 pm  Show Profile   Bookmark this reply Add Archraz to your friends list Get a Link to this Reply
JimR- I had wondered that as well, but I just wonder why this particular composition is affected that way.
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