  Bimodality is a common feature of globular cluster (GC) color distributions
in galaxies. Although it is well known that the GC system of the Milky Way is
bimodal in metallicity, this has yet to be directly demonstrated for an
elliptical galaxy. We use Lick index measurements from the literature to derive
metallicities for 47 GCs in the giant Virgo elliptical galaxy NGC 4472. The
resulting distribution shows clear evidence for two metallicity subpopulations
of GCs.
