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Platinum Blue








With mercurous nitrate, the platinocyanide of potassium forms a thick
smalt blue, and the platinidcyanide a dark blue precipitate. The
compound is a mixture of platino- or platinidcyanide of mercury and
mercurous nitrate. Upon the presence of the latter the colour seems to
depend, for on washing with cold water containing nitric acid, the
nitrate is not removed nor the blue affected; but boiling water extracts
the nitrate and leaves a white residue. A blue containing mercurous
nitrate must necessarily be injured by impure air, and be otherwise
objectionable.





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