Contractions. - Cupr-s. C-su.

Present name. - Cupric Sulphate. CuSo4,5H1O.

Sulphate of Copper. Blue Vitriol.

May be obtained pure from the operative chemists.

Characters and Tests. - A blue crystalline salt, in oblique prisms, soluble in water, forming a pale blue solution which strongly reddens litmus. The aqueous solution gives with Chloride of Barium a white precipitate insoluble in Hydrochloric Acid, and a maroon-red precipitate with yellow Prussiate of Potash. If an aqueous solution of the salt be mixed with twice its volume of solution of Chlorine, and solution of Ammonia be added, the precipitate formed by the first addition of the Ammonia will be dissolved by a further and sufficient addition of the alkali, and a violet-blue solution will be produced, leaving nothing undissolved.

Preparation. - Solution in distilled water for lx; distilled water to which 5 per cent. of rectified spirit has been added for 1; dilute alcohol for 3x; 20 O.P. spirit for 2; and rectified spirit for 5x and upwards.

Reference to Horn. Proving. - Noack and Trinks.

Proper forms for dispensing.lx to 3x, Solution only. 2 and upwards, Tincture, Pilules, or Globules.