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Red

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Red is a color at the lowest frequencies of light discernible by the human eye. Red light has a wavelength of roughly 700 nm. Oxygenated blood is red due to the presence of hemoglobin.

On a browser that supports visual formatting in Cascading Style Sheets, the following box should appear in this color:

 
Lower frequencies are called infrared, or far red.

Usage, symbolism, colloquial expressions

wikipedia.org dumped 2003-03-17 with terodump