Elsner's Green

is also a combination of tin and copper. It is made by adding to a

solution of sulphate of copper a decoction of fustic, previously

clarified by a solution of gelatine. To this mixture are added ten or

eleven per cent. of protochloride of tin, and lastly an excess of

caustic potash or soda. The precipitate is then washed and dried,

whereupon it takes a green colour tinged with blue, but without the

brightness or durability of the preceding stannate.

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