INKS. 389 



ingenious chemists have been induced to nrike experiments, in order 

 to render it more perfect. 



M. Ribaucourt, in the lt Annales de Chimie," directs eight ounces 

 of Aleppo galls, and four ounces of logwood, to be boiled in twelve 

 pounds of water, till the quantity is reduced to one half ; when the 

 liquor should be strained through a linen or hair sieve into a proper 

 vessel. Four ounces of sulphate of iron (green vitriol); three 

 ounces of gum-arabic ; one ounce of sulphate of copper (blue 

 vitriol) ; and a similar quantity of sugar. candy, are now to be 

 added : the liquid should be frequently shaken, to facilitate the so. 

 lution of the salts. As soon as these ingredients are perfectly dis. 

 solved, the composition is suffered to subside for twenty. four hours ; 

 when the ink may be decanted from the gross sediment, and pre- 

 served for use in glass or stone bottles, well stopped. 



This ink exhibits a purplish black colour in the bottles ; but the 

 writing performed with it is said to be of a beautiful black cast, 

 which it retains, unaltered, for a considerable length of time. Each 

 quart of the preparation contains : 



oz. drs. TJ, 



Of Galls .... 2 5 20 

 Greeo vitriol - 1 2 40 

 Logwood - 1 2 40 



Gum . . .10 

 Blue vitriol - 2 40 

 Sugar-candy 2 40 



M. Ribaucourt is of opinion, that ink thus pn pand, mny be 

 preserved several years in a state of perfection, without depositing 

 either galls or iron. 



The ink commonly used, is manufactured by stationers, accord, 

 ing to Dr. Lewis's recipe ; but it is ill calculated for keeping, as it 

 deposits a black sediment, while the fluid itself is of a pale colour. 

 Each quart of this ink contains : 



oz. drs. grs. 



Of Galls .... 3 

 Green vitriol -10 

 Logwood . - 5 24 

 Gum - . . 1-0 



Neither blue vitriol nor sugar are employed in this preparation. 

 As, however, both the ink made after the latter method, and that 

 compounded according to other recipes, are not adapted to resut 



ici 



