A Contra Vision® Perforated Window Film™ is typically 30-40% transparent. If you are standing outside the window it appears white and blocks the view into buildings during the daytime. This is because the eye is drawn to the white material which reflects more light than passes through window from the darker interior.
From the inside, the tiny perforations in the one-way window film allow daylight into the room. This outside light dominates your eye’s attention rather than the perforated material which is colored black on the inside to make it less noticeable.