Cupric Sulfate: Bluestone; blue, Roman or Salzburg vitriol. CUSO₄ • 5H₂O; mol. wt. 249.69. Anhydr. salt 63.92%, H₂O 36.08%, Cu 25.45%, SO₄ 38.47%, CuO 31.86%, SO₃ 32.07%, H₂SO₄, 39.28%. The U.S.P. grade is at least 99%, the ordinary grade of commerce is about 98% pure.

Blue, transparent, large triclinic crystals or blue granules or light blue powder. Slowly efflorescent in dry air; loses 2H₂O at 45°, 4H₂O at 110°, the last H₂O at 250°; decomposes above 400°. d. 2.87. One gram dissolves in 3 ml. water, 0.5 ml. boil. water, 2.8 ml. glycerol, 500 ml. alcohol; solubility in water decreased by H₂SO₄ or (NH₄)₂ SO₄. The aq. soln. is acid to litmus.

Use: In dyeing cotton and silk; manuf. green and blue pigments; for electroplating with copper soap; ink for marking tin; hair dye; insecticide mixtures (Bordeaux mixture, etc.) for treating the "white disease" of vines caused by Oidium; preserving bides, wood, and railway ties; tanning leather; electric batteries; process engraving; destroying algae, etc., in pools; as primary standard in analytical chemistry.

Grades available: Reagent, U.S.P., technical.

Med. Use: Has been used as an astringent, antiseptic, caustic, and in phosphorus poisoning. Caution: Must be evacuated from stomach promptly.

Vet. Use: Locally in ulcers, fungus skin diseases, vaginitis, urethritis; canker of horses; foot rot of sheep; granular conjunctivitis of dogs. Intern. emetic in phosphorus poisoning; haemonchosis of cattle; haemonchosis, tapeworm, swayback of sheep; anemia of newborn pigs.

Cupric Sulfate - ammoniated: Incorrectly designated "copper ammonium sulfate." CuSO₄ • 4NH₃ • H₂O; mol. wt. 245.75. Anhydr. salt 92.67%, H₂O 7.33%, CuSO₄ 64.95%, Cu 25.86%, NH₃ 27.72%, SO₄ 39.09%, CuO 32.37%, SO₃ 32.58%.

Dark-blue, cryst. powder; ammonia odor; loses NH₃ on exposure to air. Very soluble in water with deep-blue color; almost insoluble in alcohol.

Use: Calico printing; as insecticide for Peronospora fungus.

Commercially available.

Cupric Sulfate - anhydrous: CuSO₄; mol. wt. 159.61. Cu 39.81%, SO₃ 50.16%.

White or grayish-white, hygroscopic powder. Soluble in water.

Keep tightly closed.

Grades available: Reagent.

Cupric Sulfate - Basic: Copper subsulfate. Variable composition; usually contains 50-53% Cu.

Light-blue powder. Insoluble in water; soluble in dil. acids.

Commercially available.

Cupric Sulfate - dried: see Cupric Sulfate Monohydrate.

Cupric Sulfate - Monohydrate: Cupric sulfate dried. CuSO₄ • H₂O; mol. wt. 177.62. Anhydr. salt 89.86%, H₂O 10.14%, Cu 35.77%, SO₄ 54.07%, CuO 44.78%, SO₄ 45.08%.

Almost white powder. Soluble in water; insoluble in alcohol.

Commercially available.