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Has anyone else come across this toning? This is a coin that has been in display, however, the obverse has been facing the pad and is not exposed to light. There are other coins on display but this is the only one in the series with toning. The guilloche design has helped to create some particularly attractive warm toning - which I love. This is often the step before the iridescent toning which we tend to see on much older coins. The photo doesn't do it justice. It is odd though, as the reverse with the unicorn design has been continuously exposed and shows no sign of toning. Interesting as this is the latest in the series. What do you think? 

2018queensbeastunicorn2ozsilvercointonedobvcrop.jpg

2018queensbeastunicorn2ozsilvercointonedrevcrop.jpg

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1 hour ago, Pete said:

Suggests a chemical reaction with whatever the coin was lying on - plastic foam of some sort leeching out trace gases ?

Hmm, that doesn't explain why the other Queen's Beast coins have not toned though....or other silver coins from different mints

1 hour ago, airmac said:

I had a britannia like that.

 

with the guilloche?

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