BED MEKODEIO OXIDE 207 



III. — Unguentum Hydrargyri. Mercurial Ointment. (U. S. & B. P.) 

 (Blue Ointment.) 



Synonym. — Pommade mercurielle, pommade Napolitaine, Fr. ; 

 graue quecksilbersalbe, G. 



Mercury, 500 gm. ; lard, 350 gm. ; suet, 230 gm. ; oleate of mercury, 

 30 gm. Contains 50 per cent, of mercury. (U. S. P.) 



Hydrakgyei Oxidum Rubeum. Red Mercuric Oxide. HgO. 



(U. S. & B. P.) 



Synonym. — Hydrargyrum oxydatam rubrum, P. G.; 

 hydrargyri-nitrico-oxydum, mercurius corrosivus (prsBcipi- 

 tatus) ruber, oxydum hydrargyri cum, peroxide of mercury, 

 red precipitate, mercuric oxide, E.; deuto-oxyde (peroxyde) 

 de mercure, oxyde mercurique, precipite rouge, poudre de 

 Jean de Vigo, Fr.; rotlies quecksilberoxyde, rother pracipi- 

 tat (quecksilber-pracipitat), G. 



Derivation.. — Dissolve mercury in diluted nitric acid. 



3 Hg, ^- 16 HNO, = 6 Hg (NO,),.- (Mercuric nitrate) 

 + 4 NO + 8 H,0. 



Rub mercuric nitrate with metallic mercury and heat. 



2 Hg (NO3), + Hg, = 4 HgO + 2 NA._ 



Properties. — Heavy, orange-red, crystalline scales, or a 

 crystalline powder ; odorless, and having a somewhat 

 metallic taste ; permanent in the air ; almost insoluble in 

 water ; insoluble in alcohol. 



PREPARATION. 



Unguentum Hydrargyri Oxidi Bubri. Ointment of Red Mercuric Oxide. 



(U. S. & B. P.) 



Synonym. — Red precipitate ointment, red mercuric oxide, 10; cas- 

 tor oil, 5; ointment, 85. (U. S. P.) 



Hydraegybi Oxidum Flavum. Yellow Mercuric Oxide. HgO. 



(U. S. & B. P.) 



Synonym.— B-jdiargyT-am oxydatum via humida para- 

 tum, P. G.; hydrargyrum oxydatum prsecipitatum (vel 



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