Color - Red

About

red is:

a hue color (chromatic)
a pure color without additive.
one of the percepted human colors.
is used as primary color:
- coordinate in a colorspace (for instance the rgb colorspace)
- in a rgb wheel
located at 650 nm on the visual spectrum
close to orange in the visual spectrum
is the highest wavelength in the visual spectrum (has therefore less dispersion and is the color of the sunset among with its closest color orange)
located at 0 degree in a rgb additive wheel
a plus color (additive color)
used mostly in a additive color model - ie with light (screen, monitor,…) and not with pigment (painting, printing, inking)
coupled with this emotions: passion, power, love, danger, excitement
is a warm color

This is the more common color to avert of a danger (mainly due to the color of the blood).

in a additive model: cyan
in a subtractive model: green (You need to stop at a red sign but you can start again at a green sign)

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