It can also be used as a reagent in the preparation of other chromyl compounds. Chlorides are confirmed by the "chromyl chloride test". With concentrated hydrochloric acid, it converts to chromyl chloride. Frequent exposure of the skin to chromyl chloride may result in ulceration. Chromyl chloride is a chemical compound with the formula CrOCl. Chromyl fluoride can exchange fluorine atoms with metal oxides. Chromyl fluoride is an inorganic compound with the formula CrOF. An example of a closed-shell abstractor is chromyl chloride. Chromyl chloride oxidizes internal alkenes to alpha-chloroketones or related derivatives. Chromyl fluoride will also convert the oxides of boron and silicon to the fluorides. If chloride is present, chromyl chloride forms as evidenced by red fumes of CrOCl.