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Mercury(II) iodide (HgI2) is a chemical compound with an appearance of red-orange crystals. Unlike mercury(II) chloride it is hardly soluble in water (<100 ppm).
Additional recommended knowledge
Mercury(II) iodide displays thermochromism; when heated above 126 °C, it undergoes phase transition from the alpha crystalline form to a pale yellow beta form. As the sample cools, it gradually reacquires its original color. It is often used for thermochromism demonstrations. 
In medicine, mercury(II) iodide was formerly used as a treatment for syphilis.
Mercury(II) iodide is one of the stated possibilities for the "red mercury".
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Mercury(II)_iodide". A list of authors is available in Wikipedia.|