336 MISCELLANEOUS. 



upon the glass. When it is dry, wet it ever with 

 oil of turpentine till it is transparent, and set it by 

 to dry, when it will be fit for painting. The 

 colours used for painting in this manner are the 

 usual oil colours, and there is nothing in the pro- 

 cess particular. 



To make Artificial Pearls. 



Take the Uay or bleak Jish, which is very com- 

 mon in the rivers near London, and scrape off the 

 fine silvery scales from the belly. Wash and rub 

 these in water. Then suffer this water to settle, 

 and a sediment will be found of an oily consistence. 

 A little of this is to be dropped into a hollow glass 

 bead of a bluish tint, and shaken about, so as to 

 cover all the internal surface. After this, the bead 

 is filled up with melted white wax, to give it solidity 

 and weight. 



To prepare the Nuremberg Powder of variegated 

 Colour. 



t 

 Mix together clean filings of copper, brass, iron, 



steel, and other metals. Put each of them sepa- 

 rately into ah iron vessel, and heat them till they 

 change colour. The degree of heat can only be 

 regulated by trial. Take these to a good flatting- 

 mill, furnished with a funnel at top, and pass these 

 filings through it, and you will procure a most 

 beautiful sparkling powder of all sorts of lively 

 colours. 



