Directions for making Ink . 93 
Galls bruifed, two Ounces of green Vitriol 
or Copperas, and two Ounces of Gum Ara¬ 
bic grofly powdered. Let the Mixture be 
well fliaken or ftirr’d about now and then, 
and in twenty-four Hours it will be fit 
for Ufe. It is moft conveniently made in 
a wide-mouthed Bottle that will hold near 
double the Quantity, where it may fome- 
times be lhaken together brifkly; but be 
fure you let it fettle again before you pour 
any off. When you have ufed all that 
can be got off clear, a little more than half 
the Quantity of the fame Ingredients will 
make you another Quart/ 
What is written with this Ink looks pale 
at firlt, but after a few hours becomes of a 
fine black? and I believe will never change* * 
CHAP. XIV. 
Dijtilled Verdigrease. 
V ERDIGREASE is a blueilh green 
Efflorefcence * or Ruft, produced 
on Plates of Copper, by corroding the 
Surface thereof with that penetrating 
acid Spirit which the Hulks of Grapes 
abound with after they have been prefs’d 
and laid together to ferment. This Rufl 
* Vide Lemer/s Chemiftry, chap. vi. Bcerhaave'a Che- 
sniftry, by Shaw? Vol. II. page 137. 
being 
