Top panel: comparison between the literature upper limits (triangles) and detections of dust in GCs (squares, see Table 3) with the theoretical expectations from Table 1. Perfect agreement is marked by the orange line, where 1 and 3σ uncertainties are shaded in yellow and dark yellow, respectively. Bottom panel: our dust estimates for the Stetson et al. (2019) GCs are compared with the same theoretical predictions. The clean GCs are plotted in green, the high-reddening ones in yellow, the contaminated in red (see Sect. 3). All estimates were corrected for foreground contamination using 3D cumulative reddening maps (Lallement et al. 2022). 1 σ uncertainties are plotted in all panels.