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Unlike window film, privacy glass is a pigment within the glass that is installed during the manufacturing process. There is no way to remove the tint from the glass except to replace the glass with untinted glass. The only alternative to getting the same benefits of window film is to install window film over the factory tint.
The thicker window films known as safety and security window film are designed to perform under extreme conditions, and as such there are specific standard criteria these films should meet, such as American standards ANSI Z.97, CPSC 16 CFR 1201, Cat II (400 ft-lb), and the British Standards BS 6206 (Class A, B, C).
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The term "smart window" originated in the 1980s. It was introduced by Swedish material physicist Claes-Göran Granqvist from Chalmers University of Technology, who was brainstorming ideas for making building materials more energy efficient with scientists from Lawrence Berkeley National Laboratory in California.
When shooting day for night, the scene is typically underexposed in-camera or darkened during post-production, with a blue tint added. Additional effects are often used to heighten the impression of night. As the light sensitivity of film and video cameras has improved, shooting day for night has become less common in recent years. [2]
In color theory, a tint is a mixture of a color with white, which increases lightness, while a shade is a mixture with black, which increases darkness. Both processes affect the resulting color mixture's relative saturation. A tone is produced either by mixing a color with gray, or by both tinting and shading. [1]