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).

The complementary color of red is:

• 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)

Identifier

Identifier:

• Coordinates in RGB:
  • #FF0000
  • 255,0,0
• Name: red

Demo: