Contractions. - Cupr-a. Cu-a.

Present name. - Cupric Acetate. Cu(C2H3O2)2,H1O.

Acetate of Copper.

This is obtained by dissolving Verdegris in diluted pure Acetic Acid, evaporating gently and allowing it to crystallize.

Characters and Tests. - Dark green crystals, which gradually attract moisture if exposed to the air; entirely soluble in 14 parts of cold water, yielding a deep greenish-blue solution, which becomes quite blue when diluted. The crystals blacken when heated on a knife or slip of glass, and emit the odour of vinegar. The blue solution gives a black precipitate with Sulphuretted Hydrogen, and a pale blue precipitate with Ammonia, re-dissolved into a deep blue solution by an excess of the Ammonia.

Preparation. - Solution in distilled water.

N.B. - Triturations of this very soon spoil, and as the crystals are not soluble in 10 parts of water, the strongest solution should be 1 in 20, and then 2 drops will represent 1 drop of 1x. The 1 attenuation is made with distilled water to which 5 per cent. of rectified spirit has been added; 3x with dilute alcohol, 2 with 20 O.P. spirit, 5x and upwards with rectified spirit.

Reference to Horn. Proving. - Chr. Kr., iii.

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