… Phosphides, whether or not chemically defined, excluding … or conductivity water and water of similar purity); liquid air (whether or not rare gases have been removed); …
Explanatory notes
… 28.53 ‑ Phosphides, whether or not chemically defined, excluding … or conductivity water and water of similar purity); liquid air (whether or not rare gases have been removed); … generally in Chapter 74 . Copper phosphide is a very good deoxidiser of copper, increasing the hardness of that metal; …