: ON THE SECONDARY, 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.