Integrated colors in the University of Washington C, M, T1, T2 photometric system are presented for 51 globular clusters in the Galaxy, four in Fornax, and six in M31. Several methods of evaluating the reddening relations are discussed and intrinsic colors are determined. A metallicity index based on color indices is defined which makes a significant improvement over the UBV Q index. The Fornax clusters are very metal poor, with a range suggesting a possible enrichment process; those observed in M31 are metal rich.
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Harris et al. (1977) studied this question.