Explanatory notes
… fluoride using magnesium. * * * Beryllium is a steel‑grey metal, very light and hard but extremely brittle. It … classified in Chapter 72, 74 or 75 respectively since they contain only very small proportions of beryllium. This … then reduced to produce chromium metal. Chromium is steel‑grey when unpolished, but white and shiny when polished. It …