Of these there are several varieties.

Mineral Green, Scheele's Green, or Arsenite of Copper. 1. Dissolve 11 oz. of white arsenic and 2 lbs. of carbonate of potash, by heat, in a gallon of water. Dissolve also 2 lbs. of sulphate of copper in 3 gallons of water. Filter each solution separately, and add the former gradually to the latter as long as it occasions a precipitate. Wash the precipitate, drain it, and dry it.

2. Dissolve 50 lbs. of sulphate of copper and 10 lbs. of lime in 20 gallons of good vinegar, and add quickly a boiling hot solution to 50 lbs. of white arsenic. Stir repeatedly, then allow it to settle; decant the clear liquor (which is reserved to dissolve the arsenic next time), and wash the precipitate, and dry it.

3. Emerald Green. Mix 10 parts of pure verdigris with sufficient boiling water to form a soft pulp, and strain this through a sieve. Dissolve 9 or 10 parts of white arsenic in 100 parts of boiling water, and whilst boiling, let the verdigris pulp be gradually added, constantly stirring the mixture till the precipitate becomes a heavy, granular powder.