I dont beleive I've seen this question before. Here's the basics . . .Onyx is a true black window tint, high quality film, that doesn't show blue/purple. Other low quality tints may contain a metallic substance that messes with electronics(cell phone, radio, GPS, etc.) Onyx/Charcool has a lifetime warranty & richest black and truest gray you can find in a car tint, while providing nearly 100% UV protection, and blocking over 66% of the sun's heat. It may be more money upfront, but in the long run it's worth the $$$.
My Camaro's rear window - cheap tint - purplish
Civic's rear window(onyx). If the camaro would have been outside, the sky/houses would be almost all purple.
