VI. METALS.— Salts. 



Liquor phtmhi acetatis. Liquor suhacetatis lithargyri. Litharge 

 lb. ij, distilled vinegar 1 gall., boil to lb. vj ; let it settle, and pour 

 t)ff the clear ; fouls the bottles very much, cannot be cleared off 

 with subcarb. of potash, requires oil of vitriol or aquafortis; cool- 

 ing, astringent : used to make white-wash. 



Saturnus acetosus, Pulvis extracti Satumi, Extract of lead 

 evaporated to dryness. — Subacetate of lead. Sugar of lead 3X, 

 litharge 3xv, water Jxxv ; boil to a half, and crystallize. Used 

 to separate colouring matter from fermented liquors, and set free 

 the alcohol. 



Nitrate of lead. Dissolve litharge, or fine white lead, in 

 nitric acid, sp. gr. 1'3, and crystallize. Used for preparing 

 nitrous acid. 



TIN. 



Lac spirit. Muriatic acid (sp. gr. 1*19) GOlb., tin 31b.; dis- 

 solve. L'sed in dyeing with lac dye. 



Dyers' spirit. Dyers* aquafortis 28lb., tin 41b.; dissolve 

 gradually, stirring frequently. Used in dyeing with lac dye ; if 

 for cochineal less tin is used. 



2. Nitric acid 201b., sal ammoniac 101b.; dissolve, add tinq.p. 

 which dissolves without effervescence. Used by the French dyers 

 for cochineal. 



Muriate of tin, Hydrochlorate of tin. Muriatic acid at 25 

 dog. Baume 4 oz., grain tin 1 oz. ; dissolve, evaporate, crystal- 

 lize, redissolve, recrystallize, and redissolve. Used as a test for 

 molybdic acid, platinum, corrosive sublimate, albumen and 

 tannin. 



SPELTER. 



White vitriol, Galitzen stein, IVhite copperas, Vitriolum 

 album, Zincum vitriolatum. Obtained at Goslar, by quenching 

 the roasted silver ores in troughs of water, evaporating this 

 water, setting it by to crystallize, melting the crystals, skimming 

 off the impurities, pouring the melted mass into wooden boxes, 

 and disturoing the regular crystallization by frequent stirring. 

 Contains .5*25 ox. of zinc, 5 acid, and 3'875 water; equiv. 

 IS-ttSS. Used as a dryer of oil paint. 



Vitriolum album depuratum, Sal vitrioU^ Ziiicum vitriol- 

 atum pttri/inatum^ Zinci sulphas, Sulphas zinci. Dissolve zinc in 

 oil of vitriol much diluted with water, and crystallize. 



2. White vitriol q. p. dissolve in water, add oxide of zinc, 

 digest for some hours; filter, evaporate, and crystallize: tonic, 

 astringent, and antispasmodic, gr. ' — ij ; emetic, and operating 

 very quickly, gr. x to 3ss; externally astringent. Contains 5'25 



s2 



