Contractions. - Zinc-ox. Zn-o.

Present name. - Zincic Oxide. ZnO.

Oxide of Zinc.

May be obtained pure from the operative chemists.

Characters and Tests. - A soft, nearly white, tasteless and inodorous powder, becoming pale yellow when heated. Dissolves without effervescence in diluted Nitric Acid, forming a solution which is not affected by Chloride of Barium or Nitrate of Silver, and gives with Carbonate of Ammonia a white precipitate which dissolves entirely without colour in an excess of the re-agent, forming a solution which is precipitated white by Sulphide of Ammonium.

Preparation. - Trituration.

Reference to Horn. Proving. - Noack and Trinks.

Proper forms of dispensing. - lx to 3, Trituration only. 4, dilute Tincture only. 5 and upwards, Tincture, Pilules, or Globules.