Contractions. - Merc-biniod. Mr-b.
Synonyms. - Mercurius Biniodatus, Hydrargyri Iodi-dum Rubrum (P.B.).
Present name. - Mercuric Iodide. Hgl2.
Red Iodide of Mercury.
This may be made as follows: -
Perchloride of Mercury . . . .
Iodide of Potassium . . . .
Boiling Distilled Water . . . .
Dissolve the Perchloride of Mercury in 3 pints of the water, and the Iodide of Potassium in the remainder, and mix the solutions. Having allowed the mixture to cool, collect the precipitate on a calico filter, wash it thoroughly with distilled water, and dry on a water-bath.
Characters and Tests. - A crystalline powder of a vermilion colour, becoming yellow when gently heated over a lamp on a sheet of paper; almost insoluble in water, dissolves sparingly in alcohol, but freely in ether or in an aqueous solution of Iodide of Potassium. When digested with solution of Soda it assumes a reddish-brown colour, and the fluid, cleared by filtration and mixed with solution of Starch, gives a blue precipitate on being acidulated with Nitric Acid. Entirely volatilized by a heat under redness.
Mercury, by weight . . .
Rectified Spirit ....
Preparation. - Trituration.
Reference to Horn. Proving. - Hering's New American Materia Medica.
Proper forms for dispensing. - lx to 3, Trituration only. 4, dilute Tincture only. 5 and upwards, Tincture, Pilules, or Globules.