Auto Glass Tinting
Mar/100
 Glass Tinting Limo 5% grey tintfilm auto home 40"x60" US $24.99 
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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.
polarization is a way of filtering out all light except for the light that oscilates in a certain direction. Light from the sun oscilates in all directions, but when it is reflected from a surface, it tends to oscillate very heavily in a single direction, which makes it amenable to filtering by polarlized lenses. Sub glasses are therefore designed to minimize glare from reflected surfaces. Some model cars also have polarized windshields for exactly the same reason - to minimize glare from sunlight bouncing off surfaces - like the hoods of other cars. If you look through two polarized lenses, if the polarization of the two is parallel then most light passes through - but if they are perpendicular, then most light is blocked. You are seeing light from the inside of a car that is passing through two polarized layers - that of the windshield and that of your glasses, and it is likely that the relative angle of alingment of the polarization between the two is somewhere between 0 and 90 degrees.
Here is something to try - next time you see a display of polarized sunglasses - hold one pair before your eyes - rotate the subglasses - and look at all the other polarized subglasses on the rack as you do so - you'll be amazed to see how all the glasses on the rack turn from clear to opaque as you rotate the pair in your hand
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