Explanatory notes
… monoxide, cobaltous oxide, grey oxide) (CoO). A grey, brown or greenish powder. (2) Dicobalt trioxide (cobalt … being obtained from a natural cobalt arsenide, smaltite, an ore classified in heading 26.05. A certain number of blue, … cobalt oxides obtained from the treatment of argentiferous ores ( heading 26.20 ). (B) COBALT HYDROXIDES The term …