=Mitis Green or Vienna Green= is obtained by dissolving verdigris in acetic acid and adding a boiling solution of white arsenic in water; acetic acid is then added until the precipitate dissolves. On boiling the clear solution a green precipitate forms, which, when dry, is a deep bluish-green of characteristic shade. This pigment is now practically disused because of its poisonous nature, which is equal to that of emerald green. =Copper Stannate.=—This green pigment, also known as Gentele’s green, can be made by two methods. Gentele gave the following process: 59 parts of tin are converted into stannic chloride by solution in _aqua regia_; a solution of 125 parts of copper sulphate is added and copper stannate is precipitated from the mixture by caustic soda, on washing and igniting it acquires a pretty green colour. It may also be made by fusing 59 parts of tin with saltpetre; the potassium stannate is then dissolved in dilute caustic soda and copper sulphate solution added; the precipitate is washed and ignited. Copper stannate is tolerably durable, in this respect it considerably surpasses emerald green. Only sulphuretted hydrogen has any considerable action upon it, turning it to a dirty brownish-green hue. =Kuhlmann’s Green= is a basic chloride of copper, obtained by heating 2 equivalents of lime with a solution of 3 equivalents of copper chloride. It is important that the copper salt should be present in excess. In shade Kuhlmann’s green is very similar to emerald green, with which it agrees in retaining its colour by artificial light. It is a somewhat less pure green than emerald green; the difference is only perceived when the two pigments are directly compared. When, however, it is considered that it is far more permanent than emerald green and cheaper, a more extended use is indicated than is yet the case. =Elsner’s Green= is a species of lake, made by mixing a solution of copper sulphate with a decoction of fustic, adding a small quantity of stannous chloride and precipitating with caustic soda. To 100 parts of copper sulphate 10 to 14 parts of stannous chloride are used. According as the copper salt or fustic extract predominates, the colour of the precipitate inclines to blue or yellow. Elsner’s green is also sold under the name of ”non-poisonous green”. This description is incorrect; the pigment is indeed free from arsenic, but is poisonous on account of the copper it contains.