  The $\eta_6$ is a ``heavy axion'' remnant of dynamical electroweak symmetry
breaking by a color sextet quark condensate. Electroweak scale color instanton
interactions allow it to be both very massive and yet be responsible for Strong
CP conservation in the color triplet quark sector. It may have been seen at LEP
via its two-photon decay mode and at TRISTAN via its hadronic decay modes.
