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Dysprosium(III) chloride (DyCl<sub>3</sub>), also known as dysprosium trichloride, is a compound of dysprosium and chlorine. It is a white to yellow solid which rapidly absorbs water on exposure to moist air to form a hexahydrate, DyCl<sub>3</sub>.6H<sub>2</sub>O. Simple rapid heating of the hydrate causes partial hydrolysis[1] to an oxychloride, DyOCl.