Contractions. - Aur. Mur. Au.-m.

Present name. - Auric Chloride, or Trichloride of Gold. AuCl3.

For. names: German, Gold Chloride; French, Tri-chlorure d'Or.

Prepared by dissolving pure Gold in Aqua Regia, a mixture of Nitric and Hydrochloric Acids, according to the following process: -

Take of

Fine Gold, reduced by a rolling machine to a thin lamina . . .

60 grains;

Nitric Acid . . .

1 1/2 fluid ounce;

Hydrochloric Acid . . . .

7 fluid ounces;

Distilled Water ....

A sufficiency.

Place the Gold in a flask with the Nitric Acid and 6 fluid ounces of the Hydrochloric Acid, first mixed with 4 fluid ounces of the water, and digest until it is dissolved. Add to the solution the additional fluid ounce of Hydrochloric Acid, evaporate at a heat not exceeding 212° until acid vapours cease to be given off.

Dissolve the Chloride of Gold thus obtained in 2 fluid ounces and 40 minims (1,000 minims) of distilled water.

This forms the lx solution, which should be kept in yellow actinic stoppered bottles.

Preparation. - Solution in distilled water for 1, then using dilute alcohol up to 2, and rectified spirit beyond 2.

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

Proper forms for dispensing. - lx to 2, Solution only. 5x and upwards, Tincture, Pilules, or Globules.