CLAZING VESSELS. 327 



xr. 



Koie on a Varnijh for glazing Cups, By M. 

 Parmentier*. 



iVl. BOMPOIX, chief apothecary to the French Military Account of very 



Hofpital at Genoa, having: fent me fome coffee-cups of a re- ''S"*^ "" , ' 



' '8 v cups finely vir- 



inarkable iightnef<j and glazed with a varnith which is held in ni(hed. 



great repute, perhaps on!)' becaufe its preparation is icepta (e- 

 cret in that coantr\ ; I requeued him to u(e his utmott endea- 

 vours to procure me the receipt. He obtained it through the 

 medium of one of his pupils, who learned the fecret from the 

 artificer at the manufactory, and had made from his prefcrip- 

 tion a varnifli in every refped equal to that in queftion : 



It confifted of lintfeed oil I | lbs. ; amber lib.; litharge Receipt for the. 

 in powder, minium in powder, cerufe in powder, each, 5 oz.^*""^* 



Boil the lintfeed oil in an unglazed earthen veflel, and tie 

 the litharge, minium, and cerufe in a linen bag, which is to 

 be fufpended in the oil whilft boiling, fo that it may not touch 

 the bottom of the veflTel. When the oil begins to turn brown, 

 take out the bag, and put in a clove of garlic, cleared of 

 the fkin ; continue the boiling ; and when the garlic is dried 

 away, put in another and another, to the amount of fix or 

 /even. In the mean time, the amber is to be melted in 

 another unglazed velTel, according to the method hereafter 

 prefcribed ; and when the oil has been fufficiently boiled, the 

 fufed amber is to be poured into it. 



To melt the Amber. 



Take two ounces of lintfeed oil, to foften the amber and g^J^j^g" " 

 to alfifl: its fufion by a very britk fire, and when the amber is 

 melted, add the lintfeed oil, and boil the whole about two 

 minutes. The fluid muft then be ftrained through a coarfe 

 cloth, and when cold put into a bottle well corked, to prevent 

 it from drying. 



Method of ufmg the Varnijh. 



Let the piece intended to be varniflied be firft well polifiied, ^^PPjJ^Sft."^ 

 •id then apply the varnilh in the following manner : 



* Annates de Chimie, Vol. LVI. p. 254. 



A a 2 Mix 



