I have regular 860 (tournament blue) on my table and you can clearly see the chalk dust "black" spots. My old table has Simmonis 860 Electric blue cloth and the chalk dust was never visible (or black).I have Tournament Blue (Simonis 760) on my home table and I use Master Blue chalk (the easy to find stuff) and I don't see any change in chalk color dust. Perhaps it has to do with the HR part of 860HR !?!