VI. METALS.— Salts. 255 



English verdigris. Blue vitriol 24oz. dissolved in water, 

 sugar of lead 30oz. and a half, also dissolved in water ; mix the 

 solutions, filter, crystallize by evaporation ; yields about lOoz. of 

 crystals : a superior paint to rough verdigris. 



Solution of acetate of copper. Dissolve French verdigris 

 in water to saturation. Used as a test-liquor for sulphur and 

 gold. 



iron. 



Protosulphate of iron, Sal Martis, Ferriim vitrlolatuju, 

 Fen-i sulphas. Dissolve iron turnings in dilute sulphuric acid, 

 evaporate and crystallize; tonic, ennnenagogue, anthelmintic, 

 gr. j to V. Used in glysters against ascarides; contains 4*G protox. 

 iron, 5 sulph. acid, with 7*875 water; equiv. 17'375. — Officinal 

 jyrejxiration. Mist, ferri comp,, L. Pil. ferri comp., L, 



Copperas, Commercial sulphate of iron, Green vitriol, Coupe- 

 rose verte. Vitriolum viride, V. vulgare Anglicanum, V. ferri, Feri'i 

 sulphas venale. Made by allowing martial pyrites to effloresce, 

 washing out the salt, boiling along with old iron, evaporating and 

 crystallizing. Contains muriate of iron ; crystals small, pale 

 green, become covered with a yellow efflorescence by drying : 

 this is prevented by dipping them into treacle-water, whicli 

 covers them with a liind of varnish : colour darkened by dipping 

 in a decoction of Turkey berries. Used in dyeing black, making 

 ink, and in various trades. 



Vitriol de Rome, Vitriolum Romanum, P. Bat. In large 

 crystals, deep green. From the residuum of pyrites distilled for 

 brimstone, or set on fire. 



PisAN vitriol. Resembles the Roman, but the crystals are 

 smaller and greener ; preferred by black dyers and hat-makers ; 

 probably the ba:sis of the Genoa black. Made near Pisa. 



GosLAR vitriol, V. ferrutum. Sulphate of iron and zinc, 

 pale, greenish, 



Saltzburgh vitriol, V. hermaphroditicum. Bluish green, 

 of several shades ; contains both copper and iron ; coppers iron. 



HuNGAKiAN VITRIOL, V, Hungaricum, P. Bat. Deep green; 

 contains copper. 



Dantzic VITRIOL. Green, not quite so deep as the Hunga- 

 rian ; contains copper and iron, but no muriatic acid; coppers 



iron. 



Soi.fTioN OF PROTOSCLPHATE OF IRON, Coppcras-imtcr . 

 Protosulphate of iron 3 drachms, distilled water 10 drachms; 

 dissolve. Used as a test for gold, oxygen gas in water, prussic 

 acid, and gallic acid: it is speedily aUered by the air: alho to 

 blacken leather. 



