The primary reason why the color red is used for danger
signals is that red light is scattered the least by air molecules. The effect of
scattering is inversely related to the fourth power of the wavelength of a color.
Therefore blue which has the least wavelength of all the visible radiations is scattered
the most and red which has the highest wavelength of all the colors we can see is
scattered the least. So red light is able to travel the longest distance through fog,
rain, and the alike.
Also, red is a color we inherently
perceive as one that is associated with danger. I guess it has been genetically
programmed as hot objects are red in color and also red is the color of blood. These
reasons make danger signals the most effective when they are painted in
red.
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