andfcr staining and gilding Glass. 2/1 



fiitties from escaping. After standing twenty-four hOnrs, a little 

 distilled water should be poured into the bason. The solution of 

 tin may theji be ])ut into a clean phial for use, adding to it a few 

 grains of tin ; examine it after four or five days, when the solu- 

 tion, if carefuily made, will be of a fine and clear dark colour, 

 and fit to make the purple with. Then of the solution of gold 

 take sufficient to colour distilled water of a faint straw yellow, 

 and drop gradually into it the solution of tin, and a most beau- 

 tiful purple precipitate will immediately be formed, which must 

 be thrown as it is made into a large vessel, and two or three 

 pieces of the melted tin should be put at the bottom. 



Mix the solution of tin with that of the gold in this manner 

 till the last added drops occasion no turbidness in the liquor ; 

 the precipitate is then to be washed in several hot waters, filtered 

 on the blotting paper and canvass, and while in a moist and soft 

 state, mixed with Mux, No. 4, finely powdered. 



The proportion of fiux to the purple precijiitate is always va- 

 rious, and is judged of by the mass being of a good rich and dark 

 colour, as the ingredients are ground together on the plate glass. 

 Care must be taken to grind this colour before it gets dry. 



Twenty-four grains of gold made into a precipitate in thi.s 

 manner will take two ounces of flux, a)id this may be a rule to 

 the inexperienced practitioner. 



Rose Colour. 

 To a saturated solution of gold in aqua regia (containing 

 twenty-four grains of gold), diluted with 100 times its bulk of 

 warm distilled water, having 20 grains of alum* dissolved in it, 

 add caustic ammonia drop by drop as long as any precipitate is 

 tiirovvn down, which wash in several hot waters. 



To 24 grains of gold, precipitated in this manner, put 

 Flux, No. 4 .. .. .. 2 oz. 



Fiux, No. 3 2 oz. 



Mix them together wet, and grind them on a plate glass, add- 

 ing, by a leaf at a time, sixteen leaves of leaf silver; when the 

 whole is ground fine, let it be dried on the glass, scraped off, and 

 put in a bottle for use. 



This rose colour grinds of a gray or slate colotir, but after be- 

 ing ground, if placed in a nmlile and exposed to a gentle heat, 

 it will turn to a red ; l)ut it is fit for use in either state. 



If too yellow, add a little purple ; and if too purj)le, add morfe 

 leaf bilver. 



Another Hose Colour. 

 Take purple made as before directed . . 1 oz. 



Flux, No. 3 4 



Muriate of silver . . . . . . 10 gr. 



• The rose ci.iouri* sumetimei ihafle ^vtthout any alum. 



The 



