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2. Transparency and translucency - Wikipedia

   en.wikipedia.org/wiki/Transparency_and_translucency

   The remaining frequencies (or wavelengths) are free to be reflected or transmitted. This is how colored glass is produced. Most liquids and aqueous solutions are highly transparent. For example, water, cooking oil, rubbing alcohol, air, and natural gas are all clear.

3. Window film - Wikipedia

   en.wikipedia.org/wiki/Window_film

   A layer of film (of 100 μm thickness or greater) can prevent the ejection of spall when a projectile impacts on its surface, which otherwise creates small dagger-like shards of glass that can cause injury. Switchable films can be switched from opaque to clear by a safe voltage under 36V AC.

4. Transparent conducting film - Wikipedia

   en.wikipedia.org/wiki/Transparent_conducting_film

   Doped metal oxides for use as transparent conducting layers in photovoltaic devices are typically grown on a glass substrate. This glass substrate, apart from providing a support that the oxide can grow on, has the additional benefit of blocking most infrared wavelengths greater than 2 μm for most silicates, and converting it to heat in the glass layer.

5. Window insulation film - Wikipedia

   en.wikipedia.org/wiki/Window_insulation_film

   A film is attached to the window frame to trap a pocket of air between the glass and the film, creating a double-glazed system with an insulating gap of still air. Thermal conductivity of still air is 0.024 W/(m.K) and much lower than that of glass (0.96 W/(m.K)). [1]

6. Smart glass - Wikipedia

   en.wikipedia.org/wiki/Smart_glass

   Some types of smart films can be applied to existing glass windows using either a self-adhesive smart film or special glue. [10] Spray-on methods for applying clear coatings to block heat and conduct electricity are also under development. [11]

7. See-through graphics - Wikipedia

   en.wikipedia.org/wiki/See-through_graphics

   See-through graphics can be added to glass or other transparent panels to provide advertising, branding, architectural expression, one-way privacy and solar control. See-through graphics on the outside of a window See-through graphics: the view outside is unobstructed. Perforated self-adhesive window films are often used to create see-through ...