408 Methods employed in Encaujllc Painting. 



dipped in water, but that too itrong friction penetrated to 

 the colours, and carried off a part of them. Paintings on 

 walls or wooden pannels refilled friction much better; but 

 if the hand prjffed too hard, fome of the colour was de- 

 ftroved, especially in places to which the liquid wax had not 

 fufficiently penetrated. 



To prevent thei'e inconveniences, trial was made of other 

 preparations, pointed out before by the Abbe Requeno, 

 agreeably to feveral patTagfes of Pliny and Vitruvius. Thefe 

 trials were perfectly fuccelsful, and paintings executed with 

 the preparations, as hereafter mentioned, refitted much bet- 

 ter friction with a wet fponge. The mechanifm even of 

 paintincr in this manner, with thefe colours, was found 

 more convenient and much eafier, becaufe the colours did 

 not dry fo fpeedily as thofe prepared in the Jirlt and fecond 

 manner. 



The preparation of colours agreeably to the laft method is 

 as follows : Take a vafe of vitrified earth, and place it over 

 -t. frnall fire with an ounce of v. hile wax ; and when the wax is 

 melted, add four ounces of olibanum (incenjo majchio,) reduced 

 to powder, which muft be alfo diifolved with the wax. This 

 mixture muft be put into a imall veifel with water, and you 

 will obtain a hard brittle crayon, which muft be mixed 

 with the colours when ground up. 



The fame procefs may be followed with maftic, by taking 

 five ounces of that fubftance and two of wax, and this crayon 

 will fcrve for the brighter colours. For darker colours the 

 crayon may be made of four ounces of afphaltos and two 

 ounces of wax. 



Mttkod of making Dijlanper for preparing the Colours. 

 Infufe, for twenty-four hours, a pound of the gum ol the 

 cherry-tree, and, when it. is diffolved, put it into a final! 

 canben veifel, and boil it with two ounces of wax and half 

 an ounce of clibanum reduced to a line powder. \\ hen 

 *hii liquor is cool, tike off the wax which ucats on the top, 



aid 



