Boron tribromide, BBr3, is a colorless, fuming liquid compound containing boron and bromine Boron TribromideThe Instructions of Boron Tribromide Boron tribromide, BBr3, is a colorless, fuming liquid compound containing boron and bromine. It is usually made by heating boron trioxide with carbon in the presence of bromine: this generates free boron which reacts vigorously with the bromine. It is ...