Section 4, The Explosives (Protectorate) Citation

All ships being within the waters of Sierra Leone shall,whilst loading or discharging explosives keep flying flag B of the International Code of Signals, and shall also keep hoisted at the foremast head, between the hours of 6 a.m. and 6 p.m., a red flag, and, between the hours of 6 p.m. and 6 a.m., a red light, plainly visible at a distance of at least two miles, to denote that explosives are on board.