The command ribcolor assigns ribbon colors at the residue level. Even if only particular atoms are specified, the ribbon segment(s) corresponding to the entire residue(s) containing the atoms will be affected. Ribcolor is equivalent to color with the ,r specifier. The command ~ribcolor sets the ribbon colors to none (no color assigned), revealing the model-level color (see coloring hierarchy).
Color_name can be any color name that can be used with the command color, except byatom or byelement.
See also: ribbon, color, modelcolor, rainbow, rangecolor, the Actions menu