Replacement for Hand American 1µm Boron Carbide Semi-Paste?

[Mr.Wizard]

My bottle of Hand American 1 micron Boron Carbide Semi-Paste is getting a little low. I like the way this stuff coats a strop with a dense layer of abrasive after the carrier soaks into the leather. Is there something similar still on the market? Diamond with that high a concentration would probably be prohibitively expensive. Borachrome from Bernal Cutlery seems to coat a strop similarly but may be coarser if it is a blend of BC at 4000 grit (3µm?) and chromium oxide but I don't know what the HA BC particle distribution is. Perhaps it is similar?

 

[Blade Lab]

Tech Diamond Tools sells diamond pastes on Amazon in many different grit sizes and I believe three different concentrations. I like their stuff. I generally use their medium concentration on strops and light on belts.