Hello. I'm kind of new here. (I've been here for a few months but have not posted too much.) I was thinking that if some sort of one-way mirror film inside the blade would do anything still have standard films. The light would reflect completely if in a dark room. The mirror side would be inside the blade of course. I am not planning to do any kind of test or anything... I just had the idea.
Here is a place to purchase the film:
http://www.solarfilmco.com/mirror-window-film.html
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