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Hilton AC Roulettes Blue Ones Turn Green

Can anyone explain how these blue chips turn green? It is not dirt as I have tried everything to clean them. Including bleach.
The scan shows both sides of the chips. In the image with the flat chips you can see the blue edge and then there is the picture of the edges.
Barry

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Hilton AC Roulettes Blue Ones Turn Green
my guess chemical reaction

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