Why do some car windshields look purple when I'm wearing my polarized sunglasses?

Why do some car windshields look purple when I'm wearing my polarized sunglasses?

I just got some new Oakley prescription sunglasses with what they call an “Ice Blue Iridium” tint. I've noticed while driving that certain auto windshields (Mercedes and Chevy Tahoe) have a distinct purple tint when I'm wearing the glasses. All other car windshields look the same. Very curious as to what is causing this.


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