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The quark model postulates that the hadrons such as protons and neutrons have an inner structure; quarks.
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Can quarks have anti-colors?
(Do quarks have) color charges because of something? … Can quarks have anti-colors?
A basic tenet of QCD is that quarks must combine to be colorless. If quarks could gain anti-color we would expect to see quark-quark pairs but we don't. …