Intrinsic colors of globular clusters in the UBV system

It is shown that the color excess ratio E ( U - B ) / E (B - V) for globular clusters increases with advancing integrated spectral types, that the spectral types are closely correlated with the intrinsic color index (B - V)0, and that the intrinsic colors (U-B)0 and (B - V)0 of galactic globular clusters define a dispersion-free rela- tion in the two color dlagram. New reddening values are determined for 86 clusters, and the advantages and limitations of broadband UB V photometry of the integrated light of globular clusters are discussed.