and for staining and gilding Glass, 269 



Blue flirt gl»9s 10| 



Raw borax . . , . . . 71 



Red icad 12 



Calcine these well together, and take of It 2 



Flux, No. ^5 I 



Grind in water for use. 



Blacks are compounded in other proportions of these ingre- 

 dients, and manganese is sometimes substituted in the place of 

 umber. 



Another Black. 

 Take umber calcined black . . 1 



Black oxide of cobalt .. ., 1| 



Black oxide of copper .. ,, ^ 



Flux, No. 4 3 



Grind these in water, and when drieii place them on a piece 

 of Dutch tile, (washed over with flint-powder ground in water,) 

 in a muffle in a charcoal fire, and calcine them so as to stick to- 

 gether ; then add to it one-half of Flux, No. 4. Both these 

 blacks, if too soft, are hardened by adding a little black oxide of 

 coJjalt. 



Black /or shading and drawing under the Greens. 

 Take manganese . . , , 5 



Royal smalt , . , . . . 1 



ground fine in water, and calcined to a high degree of heat in 



a muffle. 



A beautiful Black, for solid grounds or inlaying, hut does not 



mix generally. 



Take black oxide of copper . . 1 



Flux, No. 4 2 



Grind in water for use. 



A Frit for transparent Greens. 



Take flint powder . . 3 

 Flux, No. 2 . . . . 3 

 Green pot-metal glass 1 ; 



Red lead , . . . H 

 Raw borax . . . . 2| 

 Green oxide of copper 1 1 



Melt them in a crucible, pour out the mass, and pound it in 

 an earthenware mortar. 



Green. 

 Take of the green frit . . , , . , , . 3 



Of yellow enamel colour m^de up as before directed 1|- 

 If too soft add Naples yellow. 

 Grind in water for use. 



Another Green. 



TcSte of green frit , , , , . , 5 



FlUK, 



