… Sulphides; polysulphides, whether or not chemically defined. …
Explanatory notes
… 28.30 ‑ Sulphides; polysulphides, whether or not chemically defined. 2830.10 ‑ Sodium sulphides 2830.90 ‑ … is sometimes applied to the acid sulphides. Sulphides of non‑metals are excluded ( heading 28.13 ). (1) Sodium … a luminophore of heading 32.06 . It should, however, be noted that zinc sulphide is classified in this heading only …