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Soluble Prussian Blue

Add a solution of protosulphate of iron to a solution of prussiate of potash, and expose the precipitate to the air till it becomes blue, and wash it till the soluble salts are washed away. By continuing the washing, the blue itself dis- 2611. To Dye Silks or Woolens Vio- Or, add a solution of persulphate of iron to a may be evaporated without decomposition. let or Purple with Aniline. Violets and solution of ferroprussiate of potash, keeping lastly through water alone. (Sce No. 333.) purples are produced on wool in the same manner as the blue; on silk the same method is used likewise, but the water must only be heated short of boiling. (Sce Nos. 315 and 316.) the latter in excess; wash the precipitate until it begins to dissolve, and dry it. (See No. 2488 for another method.)