230 VI. METALS.— Gold. 



SuLPHURET OF QUICKSILVER ? Cinnaharis antimonii. Ob- 

 tained as a secondary product in the making of butter of anti- 

 mony, by raising the fire after the butter has come over. 



2. Quicksilver 151b., rough brimstone, 5lb., common antimony 

 lib. and a half; mix and sublime: brown red. Perhaps com- 

 posed of 25 quick, with 2 sulph., equiv. ST. 



TIN. 



AuRUM MUSivuM, Bisulphuret of tin, Aurum mosaicum. 

 Quicksilver, tin, sulphur, sal ammoniac, ana p. seq., the tin being 

 first melted, the quicksilver poured into it, and then the whole 

 ground together, and sublimed in a bolt head: the Aurum 

 musivum lies at the bottom ; composed of 7*25 tin, with 4 of 

 sulph., equiv. 11-25. 



2. Dissolve tin in muriatic acid, precipitate by subcarb. of soda, 

 mix the precipitate with half its weight of sulphur, and subhme. 



. 3. Tin filings, sulphur, sal ammoniac, ana p. seq. ; sublime. 

 In these subhmations, if the fire is too great, only a grey sulphuret 

 of tin is obtained. Used as a metallic gold colour in varnish work 

 and sealing-wax. 



METALS. 



GOLD. 



Grain gold, Aurum, Cupelled gold melted with sufficient 

 silver to form only l-4th of the mass, granulated by being poured 

 from on high in a small stream into water,, the silver dissolved 

 away by nitric acid, and the grains heated to give them their 

 proper lustre. Used to make preparations of gold; equivalent 25. 



Gold leaf, Aurum foliatum, Aurum in lihellis. Used to gild 

 pills and other substances. — Party gold. Gilt silvar hammered 

 into leaves. 



Shell gold, Aurum in miisculis. Grind the cuttings of gold 

 leaf with thick gum water, and spread the ground gold on colour 

 shells. 



Gold powder, Aurum pulveratum. Grain gold, 1 oz., quick- 

 silver, nearly boiling, 6 oz. ; rub together ; distil off the quick- 

 silver, or corrode it away with spirit of nitre, and heat the black 

 powder that is left to redness. 



2. Grain gold 1 oz. dissolve in aqua regia ; add to the clear 

 solution green vitriol 4 oz. dissolved in water: wash the precipi- 

 tate, and heat it to redness. Used in painting, gildiiig, &c. 



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