Synonyms. - Mercurii Cyanuretum, Hydrargyri Cyanuretum, H. Cyanidum.

Present name. - Mercuric Cyanide, HgC2N2.

Bi-cyanide of Mercury.

The Cyanuret of Mercury, the directions for the making of which as directed by Hale are given, though it is doubtful if he obtains any result different from that of the pure Bi-cyanide of Mercury of the U.S. Pharmacopoeia. The crystals are the same shape, and the tests those which the pure salt answers to.

"This salt is prepared by dissolving in 16 parts of water in a glass flask 2 parts of crystallized Ferro-cyanuret of Potassium, and then adding 3 parts of dry Persulphate of Mercury. Boil for half an hour in a sand bath, filter, and evaporate to dryness, stirring constantly. Powder the dried mass, digest it with eight times its weight of 80° alcohol for some hours, filter while hot, wash the residue on the filter with hot alcohol, and set aside to crystallize. Collect the crystals, evaporate the molten liquor to dryness, and preserve the whole in a well-closed bottle excluded from the light.

It is formed in white, more or less transparent four-sided prisms and pyramids, which are odourless, but have a pungent, nauseous, metallic taste. Heated in a close glass tube, the crystals fly in pieces, and decompose. Water at 60° F. dissolves 1-11th part of its weight of the salt; at 212° F., 2-5ths of its weight; 80° alcohol dissolves l-22nd of its weight, and, when boiling, l-5th of its weight."

Like corrosive sublimate, this is a very powerful preparation of Mercury.

Reference to Horn. Proving. - Hale's New Remedies.

Preparations. - Solution in rectified spirit. Trituration.