Colour Charge
colour
Image from Bernd Helfert
The charge of the strong nuclear force. While electromagnetic charge can be positive or negative, the nuclear force charge can take three values: "red", "green" and "blue" (this has nothing to do with optical colour). Colour charge is transmitted by gluons. Colour charge is confined: quantum chromodynamics prevents coloured groups of particles, resisting efforts to separate groups with equal red, green and blue charge.
 
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Development Notes
Text by Anders Sandberg

Initially published on 24 September 2001.