After posting the question, I learned that the polarized pattern is due to
the heating of the glass during the tempering process.
On-line Snack discussion wrote:
> That sounds like a good research project for you. Let us know what you
> find out.
> Nina Thayer
> Snacktalk Moderator
> > So, what is it about the glass used in car rear windows that causes them to
> > reflect polarized patterns?
> > Thanks
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