Potassium chloroplatinate

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A yellow crystalline powder. Potassium chloroplatinate was sold for a short time in the late 18th and early 19th century as an artists pigment, called platina yellow. It was initially called lemon yellow. Potassium chloroplatinate is now used in photography.

Chemical structure

Potassium chloroplatinate.jpg

Synonyms and Related Terms

lemon yellow; platina yellow; platinum potassium chloride; potassium platinichloride


  • Toxic by ingestion and inhalation.
  • Contact may cause irritation or allergic reactions.
  • Fisher Scientific: MSDS

Physical and Chemical Properties

Slightly soluble in water. Insoluble in ethanol.

Composition K2PtCl6
CAS 16921-30-5
Melting Point 250 C (dec)
Density 3.499 g/ml
Molecular Weight mol. wt. = 485.9946
Refractive Index 1.827

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • R.D. Harley, Artists' Pigments c. 1600-1835, Butterworth Scientific, London, 1982
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index=1.827