Color distributions of diffuse star clusters (black line) compared to colors of globular clusters (filled gray area) for the 12 galaxies in Table 1. Galaxies are ordered by decreasing B luminosity as in Fig. 6. All distributions have been subtracted for the expected contamination from foreground and background sources. All histograms use 0.1 mag bins except for the GCs for the four brightest galaxies (top row), which are binned in 0.05 mag intervals. Vertical dashed lines mark the median color of the diffuse sources. This population is typically redder than even the red GC subpopulation.