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: -
Fine Gold, reduced by a rolling machine to a thin lamina . . .
Nitric Acid . . .
1 1/2 fluid ounce;
Hydrochloric Acid . . . .
7 fluid ounces;
Distilled Water ....
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.