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All Forums Category: US Coins and Currency Forums Forum: US Modern Coin Grading

Rainbow Toning

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banknotelover
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Australia
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 Posted 07/21/2012  02:20 am Show Profile   Bookmark this topic Add banknotelover to your friends list Get a Link to this Message Number of Subscribers
Hi guys
Have a question... If you have say a nicely ranbow toned silver coin, how long will the rainbow toning last ?

Let's say for argument sake the toning is not artificial and the coin is say 70 years old.

Pertinax
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 Posted 07/21/2012  11:33 am  Show Profile   Bookmark this reply Add Pertinax to your friends list Get a Link to this Reply
Why would the toning disappear ?

I have silver coins that I got in change 50 years ago that had rainbow toning then and still have it.

Admittedly, I didn't take a photo of it then so it might have changed.
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banknotelover
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 Posted 07/21/2012  11:41 am  Show Profile   Bookmark this reply Add banknotelover to your friends list Get a Link to this Reply
I was under the opinion, that since its a chemical reaction, it can over time continue, therefore change and or become unappealing to the eye.
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biokemist6
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 Posted 07/21/2012  4:09 pm  Show Profile   Bookmark this reply Add biokemist6 to your friends list Get a Link to this Reply
The toning will only change over time if the coin is continually subjected to an oxidative environment. As long as the coins are stored in a neutral environment location with low heat and humidity and away from sulfur-containing carboard products, the toning should be stable for many years to come.
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banknotelover
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 Posted 07/21/2012  9:35 pm  Show Profile   Bookmark this reply Add banknotelover to your friends list Get a Link to this Reply
Thanks Biokhemist... Your name suggests you would know about this ! Cheers mate
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All Forums Category: US Coins and Currency Forums Forum: US Modern Coin Grading



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