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Thermochromism: Mercury(II) Iodide - 1 of 2


Mercury (II) iodide below 126oC is red/orange in color. This is referred to as the alpha form. Mercury (II) iodide is a thermochromic compound. That is, its color changes as heat is applied. The color change is due to a change in crystal structure. At temperatures above 126oC, mercury (II) iodide exists in its beta form, which is pale yellow.

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