Explanatory notes
… in this heading), or mixed with clay, calcium sulphate (Venetian red), etc. (it then falls in Chapter 32 ). It is … mass fusible in the manufacture of bottle‑glass. It also serves for preparing thermite (mixed with aluminium powder), … It is an amphoteric hydroxide which, after oxygenation, gives the ferrates of heading 28.41. This heading excludes …