  Glueballs are the most straightforward prediction of QCD, yet while they have
likely been produced, none has been unequivocally identified. We pursue a
backdoor approach through anomalies, and singularly the $\eta$ and $\eta$'
which brings light to this irritating situation. In particular, we advocate to
consider the full decay chain $J/\psi \rightarrow X \gamma , X \rightarrow \eta
\eta'$ (into glue-rich states followed by glue-rich decays). We also suggest
new BES III searches, namely for the $\pi_1$ into $\eta(') \pi^0$, (this would
be the partner of their recently observed $\eta_1(1855)$). Another useful
investigation would be for other channels (or semi-inclusive) $f_0 (1500)$
decays (see last section)
