Cobalt oxides are black to grayish-green crystalline powders, inorganic compounds. Insoluble in water and other solvents. Cobalt (II) oxide CoO. It is obtained by heating metallic cobalt in air or by calcining Co (OH) 2 or CoCO3 without air. Dark green (almost black) crystals. Also known as cobal..
Cobalt Sulfate is a pink to red crystalline substance, a salt of bivalent cobalt and sulfuric acid. Very hygroscopic. It dissolves well (but slowly) in water. It dissolves poorly in ethanol, concentrated sulfuric acid, slightly better in methanol and glycerin. It is restored with sulfur, carbon, ..