Abstract
The problem of long range forces between hadrons is re-examined. Without color degrees of freedom the confining potentials lead to unacceptably large van der Waals forces. The color degrees of freedom are investigated in the case of mesons taking into account both of the color singlet states of four constituents. The consistency of the color scheme requires the existence of four-quark bound states as well as two separate mesons and puts still restrictions on the confining potentials.
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