Explanatory notes
… Potassium chloride, whether or not pure, but not including cultured crystals (other than optical elements) weighing not … ). (2) Potassium sulphate, whether or not pure . (3) Crude natural potassium salts (carnallite, kainite, sylvite, … above mixed together (e.g., a fertiliser consisting of a mixture of potassium chloride and potassium sulphate). It …