274 Receipts for Enamel Colours, 



the silver will be precipitated in the form of metallic leaves on 

 the surface of the tin. Scrape it off, wash it in warm water, dry 

 it, and grind it in a mortar. 



No. 7. Take any quantity of nitrate of silver, and put into it 

 a piece of copper plate; then proceed precisely as in No. 6. 



The foregoing preparations of silver mixed with other ingre- 

 dients, in the proportions about to be described, compose all the 

 varieties of pigment which are requisite for staining glass. 



Yellow. 

 Take silver. No. 2 . . . . H 



Yellow lake lj> parts. 



Mix the ingredients, and grind them well with oil of turpen- 

 tine mixed with the thick oil of turpentine ; lay it on thin. 



Take silver. No. 1 1") 



White day, precipitated from a solution of J 

 alutn by subcarbonate of soda . . . . 3 | 



Oxalate of iron, prepared by precipitating a )>parts. 

 clear solution of sulphate of iron by oxa- | 

 late of potash • . . . . . . . 3 | 



Oxide of zinc . . . . . . . . 2 J 



Let the silver be ground first in water with the oxide of zinc, 

 and then with the other ingredients. This is intended for float- 

 ing on thick. 



Take silver. No. 3 .. H , 

 Yellow lake .. ijPa"^* 

 Grind them in spirit of turpentine and oil, and lay the mix- 

 ture on very thin. 



Take silver. No. 4 . . 1 "\ 



Yellow lake , . 1 > parts. 

 White clay . . \) 

 Grind them in spirit of turpentine and oil, and lay the mix- 

 ture on thin. 



Orange. 



Take silver, No. 6 



Venetian red and yellow ochre, equal parts, J- parts, 

 washed in water, and calcined red 

 Grind the ingredients in spirit of turpentine, with thick oil of 

 ditto, and lay the mixture on thin. 



Take silver. No. 7 ^\ parts. 



Venetian red and yellow ochre . . . . 1 J 



Grind in turpentine and oil, &:c. as the foregoing. If entire 

 panes of glass are to be tinged orange, the proportion of ochre 

 may be greatly increased. The depth of the tinge depends in 

 some measure on the heat of the furnace, and on the time that 

 the glass is exposed to it, which, though easily learned by expe- 

 rience, cannot be made the object of precise rules. 



Take 



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