Aesthetic chemistry
A Reaction of Potassium Ferrocyanide.
A. Gutbier. Z. anorg. Chem., 1904, 41, 61-62.
In:—The Journal of the Society of Chemical Industry.
23 [18] 915. September 30, 1904.
A solution of potassium ferrocyanide, when warmed with a freshly prepared
solution of phenylhydrazine, acquired a brownish-red colour, changing to bright
red and then to deep red, and finally became suddenly colourless, with the
separation of a yellowish-green precipitate and with vigorous evolution of
hydrocyanic acid and nitrogen. The mixture was now distilled with steam ; a dark-
coloured oil insoluble in caustic soda solution, distilled over, whilst a greenish-
blue residue was left, below a layer of a violet-coloured liquid. The volatile oil,
after purification, solidified, when cooled by a freezing mixture, to a bright red
mass, from which, on a earthenware plate, a yellow oil ran off, whilst a bright red
mass, melting about 45o C., remained behind. The yellow oil, when treated with
strong sulphuric acid, was coloured first green and then brown, with separation of
a solid, apparently crystalline mass.
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Well …. I confess to not knowing just what the reactions involved are, and why
Herr Gutbier cooked them up! Me thinks a check of the original source would
prove productive.
However, remembering that some ferrocyanide compounds especially iron ones
are strongly coloured, e.g., “Prussian and Milori Blue”, perhaps Herr Gutbier was
looking for new pigments.
The Chemistry of Ferrocyanides. American Cyanamid Co. 1953. Cites this paper
under Table XV, Ferrocyanides of Miscellaneous Organic Bases.
Hydrazine, phenyl-
Also same author ( Ref. 309.) Chem Cent. 1904, II, 892
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