Pumyra's Copper Bands Turning Green

Does anyone know why Pumyra’s copper bands turn green on some figures and not others? I know I’ve seen copper pennies exposed to the elements turn green. I am assuming her bands used real copper in the paint. Is this an issue of humidity?

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I dont know for sure. I have 11 Pumyra’s and none of them are turning green. I assume the level of copper used in the paint varies beween the different batches/factories? And if the level of copper is high enough, exposure to the air, humidity etc. will make it react. I think it’s unavoidable.

:eek 11!

I have a carded pumyra and the arm and neck band are green