Explanatory notes
… ore stibnite by : (1) Concentration and liquation to produce the so‑called “crude antimony” which is, in fact, … crude sulphide proper to heading 26.17 . (2) Smelting to produce impure antimony known as “singles” (regulus). (3) Further smelting to produce “star bowls” which, after refining, give the purest …