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Liberia 25 Cents Coin Toning - Questions

Hello all.

I recently acquired this very cheap Liberia copper-nickel 25 cents coin. As you can see from the photos, it displays a fair bit of blue/aqua toning. This is particularly prominent on the reverse, and it is very appealing to the eye. What is the likely cause of this toning? I am aware that certain long-term storage conditions result in toning, and often the types of plastics or cardboards used can result in different types of toning. My guess is that the reverse has been in more prominent contact with the material inducing this toning than the obverse.

Really nice little coin and a cheap addition to my toned collection. Any input here will be met with interest.

Cheers!


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