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.





Persulphomolybdates Platinum Yellow facebooktwittergoogle_plusredditpinterestlinkedinmail

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