how changeable one into another . §3 
Spirit of Nitre, and Aqua Regia, produce 
with this Metal different Kinds of Green : 
Oil of Vitriol, Oil of Sulphur, and Aqua 
Fortis, different Degrees of Blue: that, 
among!! the vegetable Acids, diflilled Vi¬ 
negar, juice of Lemon, and Spirit of Ver- 
digreafe (which is a Vinegar abforbed by 
Copper) afford different Greens : that, of 
the fix’d Alkalies, the Salt of Wormwood, 
Pot Afhes, and Oil of Tartar per deliquium, 
give all a deep and delightful Blue as do 
alfo, among the volatile Alkalies, Spirit of 
Sal Armoniac, Spirit of Urine, and Spirit of 
Hartfhorn : that, of the neutral Salts, crude 
Sal Armoniac produces a fine Blue ; na¬ 
tive Borax a deep , and Sea-Salt a Whitijh 
Green. 
e£ A Solution of Copper in any of the 
<£ beforement'ioned Acids, fio weak as 
tf to leave the Menftruum colourlefs like 
Water, may in an Inilant, by the Af- 
fuiion of a few Drops of Oil of Tar- 
t£ tar per deliquium, be converted into a 
<£ glorious Blue, or by a like Quantity of 
Spirit of Nitre into a beautiful Green: 
cc nay, by this means made Blue, may be 
<£ yet changed into Greer, by a larger Quan- 
££ tity of the Acid: and even when thus 
e ‘ made Green, again converted into its for¬ 
mer Blue, by a yet larger Quantity of the 
<£ Alkali. 
££ The blue Tindtures of Copper made 
“ in the fix’d Alkalies, may alfo be di~ 
G 2 <£ veiled 
