5^75 



SILVERING. 



Wood, paper, &c. are silvered in the same 

 manner as gilding is performed, using only silver 

 instead of gold-leaf. 



To Silver Copper or Brass. 



Cleanse the metal with aqua fortis, by washing it 

 lightly, and then throwing it into the water ; or by 

 scouring it with salt and tartar with a wire-brush. 

 Dissolve some silver in aqua fortis, and put pieces 

 of copper into the solution ; this will throw down 

 the silver in a state of metallic powder. Take 

 fifteen or twenty grains of this silver powder, and 

 mix with it two drachms of tartar, the same quan- 

 tity of common salt, and half a drachm of alum ; 

 rub the articles with this composition till they are 

 perfectly white, then brush it off, and polish them 

 with leather. 



Anotfier method. — Precipitate silver from its so- 

 lution in aqua fortis by copper, as before ; to half 

 an ounce of this silver add common salt and sal 

 ammoniac, of each two ounces, and one drachm 

 oi corrosive sublimate ; rub them together, and 

 make them into a paste with water. With this, 

 copper utensils of every kind, that have been pre- 

 viously boiled with tartar and alum, are rubbed ; 

 after which they are made red hot and polished. 



To Silver the Dial-plates of Clocks^ Scales of Ba- 

 7^omete7'S, S^x. 



Take half an ounce of silver lace, add thereto 

 an ounce of double refined aqua fortis ; put them 

 into an earthen pet, and place them over a gentle 



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