Colorless, transparent, six-sided, rhombic prisms, or a crystalline powder, permanent in the air, odorless, having a cooling, saline, and pungent taste, and a neutral reaction. Soluble in 4 parts of water at 15° C. (59° F.), and in 0.4 part of boiling water; almost insoluble in alcohol.


One part by weight in nine parts of distilled water (10 per cent.). Filter. Specific gravity 1.065 at 15° C. Proportion 10 to 1.