Encyclopedia > 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

  • Red catches people's attention, and is often seen as a sign of danger: it is thus used for warning signs.
    • The color red is often used to denote anger as in seeing red.
    • The color of blood led red to be associated with the god of war, Mars, and the reddish planet Mars became named for him.
    • Red is used to denote "stop" in traffic signs and traffic signals.

  • In Chinese symbolism, red is the color of good luck and is used for decoration and wedding attire. Money in Chinese societies is traditionally given in red packets.

  • Red is also used to denote debt - as well as losses on a balance sheet.

  • In North American stock markets, red is used to denote a drop in stock prices. In East Asian stock markets, red is used to denote a rise in stock prices.

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