70 
Copper * 
Scheele's Green : Arseniat of Copper. Dissolve in 
45 parts of boiling water, 2 pounds by weight of pound- 
ed blue vitriol or sulphat of copper. In 10 parts by 
weight of boiling water dissolve 2 parts of potash and l 
1-2 part of white arsenic, boiling it, till the latter is dis- 
solved. Then make up the liquor 45 parts by adding 
boiling water (taking a wine pint as 16 ounces). Add 
the first solution while hot, gradually to the last. A pre- 
cipitate will fall down of a fine green colour, which is arse- 
niat of copper. Wash it well and dry it. It is a good 
pigment both as an oil and water colour. 
If you want it diluted, add to your solution of blue 
vitriol one part or more, by weight of alum, in which case 
you must encrease your potash one half part for each part 
of alum. 
This is the common green used by the paper stainers. 
Brunswick green . This is said to be made by strati- 
fying shavings of copper with ground argol or tartar made 
into a paste, which I have no doubt would produce a 
good colour. But M. Kastelyn’s receipt is as follows r 
Dissolve three parts by weight of sal ammoniac in water : 
put into a close or covered vessel two parts by weight of 
copper shavings, sprinkle them from time to time with 
the solution of sal ammoniac. The green colour pro- 
duced will weigh six parts. 
Verditer , is made in three or four ways. 1st, By pre- 
cipitating copper from a solution of blue vitriol or sulphat 
of copper, by means of a clear solution of pearl or pot- 
ash. About half a part of potash by weight, or 3 fourths 
of a part of pearl ash, will throw down the cop- 
per of one part of blue vitriol. This will form a carbo- 
nat of copper, or an imitation of verdigris equally good in 
all particulars. 
2dly, By precipitating a solution of blue vitriol with 
whiting, in which case, the copper thrown down is dilute 
