Metallic iron, with a variable amount of magnetic oxide of iron.

Characters. - A fine greyish-black powder, strongly attracted by the magnet, and exhibiting metallic streaks when rubbed with firm pressure in a mortar.

Solubility. - It dissolves in hydrochloric acid with the evolution of hydrogen. (Fe + 2HC1 = FeCl2 + H2.)

Reactions. - The solution gives a light blue precipitate with the yellow prussiate of potash.

Impurity. - Magnetic oxide.

Test. - When ten grains are added to an aqueous solution of fifty grains of iodine and fifty grains of iodide of potassium (Fe +I2 = Fe I2 which dissolves in KI), and digested in a small flask at a gentle heat, the reduced iron is converted into iodide and dissolved, and not more than five grains should be left undissolved, which should be entirely soluble in hydrochloric acid (oxide).

Dose. - 1 to 5 grains.

Trochisci Ferri Redacti, B.P. Reduced Iron Lozenges, B.P. - Each lozenge contains one grain of reduced iron. Dose. - 1 to 6 lozenges.

Uses. - This preparation is generally well borne even if the stomach be somewhat irritable. It has no astringent action. When dissolved by the gastric juice it evolves hydrogen, and if sulphur be present as an impurity eructations of sulphuretted hydrogen are produced.

U.S.P. Liquor Ferri Acetatis. Solution of Acetate of Iron. - An aqueous solution of ferric acetate [Fe2(C2H3O2)6; 465.8] - containing 33 per cent. of the anhydrous salt. Sp. gr.1-160.

Preparation.

Tinctura Ferri Acetatis (Solution of Acetate 50, Alcohol 30, Acetic Ether 2). Dose. - 15 min. to 1 fl. dr.

B.P. Liquor Ferri Acetatis Fortior. Strong Solution