Quarantine with a disinfecting stove, have a right to navigate the Canal, in quarantine, subject only to the landing of those who were suffering from plague. Plain yellow, green, and even black flags have been used to symbolize disease in both ships and ports, with the color yellow having a longer historical precedent, as a color of marking for houses of infection, previous to its use as a maritime marking color for disease. The present flag used for the purpose is the "Lima" (L) flag, which is a mixture of yellow and black flags previously used. It is sometimes called the
Flag of Hong Kong overseas, the flag is displayed during days when these offices are working. Other government offices and buildings, such as hospitals, schools, departmental headquarters, sports grounds, and cultural venues should fly the flag on occasions such as the National Day of the PRC (1 October), the Hong Kong Special Administrative Region Establishment Day (1 July), and New Year's Day. The flag should be raised at 8:00 a.m. and lowered at 6:00 p.m. The raising and lowering of the flag should be done slowly; it must reach the peak of the flag staff when it is raised, and it may not touch