Explanatory notes
… of cerulean blue (with zinc aluminate), azure blue, smalt blue, Saxony blue, Sèvres blue, etc. (f) Zinc … (i.e., melted or cast chromate) often containing a small quantity of sodium sulphate. Used in tanning … gold metallurgy. Potassium manganate (K 2 MnO 4 ), in small greenish‑black crystals. Used for preparing the …