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2018-D Cumberland Island Quarter. What Causes The Rainbow Color?

 
 
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 Posted 06/20/2019  1:23 pm Show Profile   Bookmark this topic Add NewbieCoiner808 to your friends list Get a Link to this Message
On AU/BU coins, what causes the rainbow color and why does that add value?

Helen Keller could find a DDO easier than me
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 Posted 06/20/2019  1:52 pm  Show Profile   Bookmark this reply Add John1 to your friends list Get a Link to this Reply
Looks like environmental damage toning to me.QUA shows it best. Rainbow toning that has nice eye appeal may add a premium to the right buyer.
John1
( I'm no pro, it's just my humble opinion )
Searched 5+ Million Cents Since 1971
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 Posted 06/20/2019  2:06 pm  Show Profile   Bookmark this reply Add Big-Kingdom to your friends list Get a Link to this Reply
Conditions where it was stored mostly. Could be from sulfur in paper in a coin folder, could be air polutants, could be temp changes from hot to cold creating slight condensation on the coin from humidity. A lot of environmental factors at play as to why toning happens, and rainbow. This looks natural to me, although rapid considering the date of it.

Some collector might want that toning and pay for it. Many people want clean clear coins without it.

It's preference really. I don't think the condition of the coin itself warrants much premium above face value but give it another 50-100 years and see where the toning is at and what examples are left for collectors above whatever grade that coin is. Ya never know.

You could probably get $2 -$5 for it on the bay now though from somebody, it's just not something a coin shop would buy from you if you tried to sell it there.
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 Posted 06/20/2019  2:57 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Agree with the above comments. Unfortunately, the discolored area at 7-8 o'clock on the obverse detracts from this example.
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 Posted 06/20/2019  11:20 pm  Show Profile   Bookmark this reply Add NewbieCoiner808 to your friends list Get a Link to this Reply
Thank you guys for the input. I learn a lot more everyday
Helen Keller could find a DDO easier than me
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