Gluons are spin 1 particles so the Strong Force can both attract and repulse. The constituent partons of a meson are a quark and an antiquark so they must carry a given color and its anticolor, respectively, in order that there is no net color carried by the parton. In that case, the force between the quark and antiquark must be always attractive since it involves opposite type of charges. Is that reasoning correct? If so, how does this work for a baryon, which contains 3 constituent quarks of 3 different colors? Could we have both attractive and repulsive components in the (overall attractive) confinement force, or is QCD also always attractive in that case?