Platinocyanide, barium potassium

Sodium Potassium Platinocyanide, NaKPt(CN)4.3H20, results when the copper salt is decomposed with a mixed solution of sodium and potassium carbonates.4 It crystallises in beautiful orange-coloured monoclinic prisms, and closely resembles the barium potassium salt. Its crystallographic elements are 3 ... 

Potassium Barium Platinocyanide, BaK2[Pt(CN)4]2.Aq, is obtained by crystallising mixed solutions of barium and potassium platino-cyanides. In appearance it resembles the sodium potassium salt.3... 

Sodium Platinocyanide, Na2Pt(CN)4.3H20, was first prepared by Quadrat,1 who decomposed the copper salt with sodium hydroxide. It also results on decomposing the barium salt with sodium sulphate.2 Martius acted on the potassium salt in concentrated solution with hydrofluosilicie acid, and saturated the filtrate with sodium carbonate. 

If the (much dearer) chemical, barium platinocyanide be used, tne phosphorescence is much stronger and of a greenish tinge. It is with this chemical that X Ray screens are coated. Another chemical almost equally brilliant (phosphorescing blue) is potassium platinocyanide it is also equally dear. 

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