Explanatory notes
… azure, enamel blue and Sèvres blue. The term “smalt” is applied indiscriminately to the oxides and to their … obtained from a natural cobalt arsenide, smaltite, an ore classified in heading 26.05. A certain number of blue, green … hydroxide (Co(OH) 2 ), used for the preparation of driers, and cobaltic hydroxide (e.g., Co(OH) 3 ), obtained …