transparent is an object which allows transmission of light through it..
transparrent?
well it seems to need to be transparrent, easily moulded, and tough so not to smash <><><> Window FRAMES do not need to be transparent- but they DO need to resist being degraded by the ultraviolet light in sunlight, not become brittle under cold temperatures, and resist warping or deforming.
Potassium bromide (KBr) is commonly used in infrared (IR) spectroscopy as a method to prepare solid samples for analysis. The sample is mixed with KBr and compressed into a pellet, which allows for better handling and analysis. KBr has a wide transmission range in the IR spectrum and is transparent to infrared radiation, making it a suitable medium for the sample to be measured.