  I present recent results from LEP which utilize differences between gluon and
quark jets to make quantitative tests of QCD. The principal topic is a
determination of the ratio of QCD color factors,
C$_{\mathrm{A}}$/C$_{\mathrm{F}}$, using either the multiplicity or
fragmentation functions of the jets. In addition, I discuss a recent
measurement of the rate of $\eta$ mesons in gluon jets compared to quark jets.
