Chromium(IV) fluoride is an inorganic compound with the chemical formula CrF<sub>4</sub>. It has a dark greenish-black color when solid. It rapidly hydrolyzes in presence of moisture in air or directly in water.
When powdered chromium or CrCl<sub>3</sub> is exposed to fluorine gas at a temperature of 350-500 ðC, a mix of CrF<sub>4</sub> and CrF<sub>5</sub> is created. Due to hydrolysis, the CrF<sub>4</sub> settles out as varnish-like brown beads upon cooling.
Chromium(IV) fluoride is easily reduced.
It will react with water: