  We have obtained medium-resolution infrared K band spectra of 44 giants in
seven heavily reddened clusters in the Galactic bulge, as well as 12 giants in
omega Centauri. We measure the equivalent widths of the Na doublet, the Ca
triplet, and the CO band head, and then apply the new technique of Frogel et al
to determine the metallicity of each star. Averaging these values, we estimate
the metallicity for each cluster, and compare our new [Fe/H] values with
previous determinations from the literature. Our estimates for each cluster
are: NGC 6256 (-1.35), NGC 6539 (-0.79), HP 1 (-1.30), Liller 1 (-0.36),
Palomar 6 (-0.52), Terzan 2 (-0.87), and Terzan 4 (-1.62). We briefly discuss
differences between the various [Fe/H] scales on which it was possible to base
our calibration, which is found to be the largest uncertainty in using this
technique to determine metallicities.
