The Principle Colors of Ivezić et al. 2004 (2004AN....325..583I) have been calibrated to HSC data (see DM-13154, DM-13651, DM-13519).  At present we are using a magnitude threshold of HSC-I < 22.0 mag for inclusion in the fit.  The SDSS data of the original Ivezić analysis went to much brighter limits, thus precluding a direct comparison of the stellar locus scatter to the deeper HSC limits.  Explore deriving the Principle Colors and their respective scatters for HSC data using a variety of magnitude thresholds.