The blackening of powdered red mercury(II) sulphide suspended in aqueous potassium iodide, upon illumination, has been investigated. The blackened material is shown to contain metacinnabar, the black form of mercury(II) sulphide, by electron spectroscopy for chemical analysis, photo-acoustic spectroscopy, thermal analysis, and X-ray powder photography.
R. S. Davidson and C. J. Willsher, J. Chem. Soc., Dalton Trans., 1981, 833 DOI: 10.1039/DT9810000833
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