it has something to do with an electric current running through the glass that makes the particles in it either scatter of form together making the glass clear or opaque. I dont remember who makes it, but I saw it on an episode of pimp my ride.
An intriguing discussion is worth comment. I believe that you should write more about this topic, it might not be a taboo subject but usually people don’;t talk about these topics. To the next! Cheers!!
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