Precautions
Being a noble metal, pure rhodium is inert. However, chemical complexes of rhodium can be reactive. Median lethal dose (LD50) for rats is 198 mg of rhodium chloride (RhCl3) per kilogram of body weight. Rhodium compounds can strongly stain human skin. Like the other noble metals, all of which are too inert to occur as chemical compounds in nature, rhodium has not been found to play, or suspected to play, any biological role. If used in elemental form rather than as compounds, the metal is harmless.
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—Marquis De Custine (1790–1857)
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—Benjamin Harrison (1833–1901)