Quarks Don't Actually Have Colors
“We may call it color charge, but the strong nuclear force obeys rules that are unique among all the phenomena in the Universe. While we ascribe colors to quarks, anticolors to antiquarks, and color-anticolor combinations to gluons, it's only a limited analogy. In truth, none of the particles or antiparticles have a color at all, but merely obey the rules of an interaction that has three fundamental types of charge, and only combinations that have no net charge under this system are allowed to exist in nature.
This intricate interaction is the only known force that can overcome the electromagnetic force and keep two particles of like electric charge bound together into a single, stable structure: the atomic nucleus. Quarks don't actually have colors, but they do have charges as governed by the strong interaction. Only with these unique properties can the building blocks of matter combine to produce the Universe we inhabit today.”
At a fundamental level, forces like gravity are easy. There’s only one type of charge, mass/energy, and it’s always attractive. The electric force is a little more complex, with two types of fundamental electric charges, positive or negative, where like charges repel and opposite charges attract. But in the theory of the strong interactions, there are three fundamental types of charge, and that changes everything. We call this color charge because of a good analogy with how additive and subtractive colors work, but we can learn even more by investigating where the analogies break down.
Nature is bizarre, but if we’re careful we can understand it. Quarks don’t actually have colors, but what they do have may be even more interesting. Come find out about it today.