Libya is the only country which has a flag with just one colour. Which colour is used?
Flag of Libya after the Egyptian Revolution of 1952 (which also formed the basis of the flags of Egypt, Iraq, Syria, and Yemen). In 1972 when Libya joined the Federation of Arab Republics its flag was adopted by the country, linking it to Egypt and Syria. It featured a golden hawk (the "Hawk of Qureish"), holding a scroll with the Arabic name of the Federation. The flag of the Libyan Arab Jamahiriya was adopted on 11 November 1977 and consisted of a green field. It was the only national flag in the world with just one colour and no design, insignia, or other
Buff (colour) colour "in the range of the Marschall color", meaning the colour in illustrations in a particular book. As a relatively inexpensive and readily-available paint colour, and one which went well alongside the near-universal black hull and white superstructure used on steamships at the time, White Star was far from the only shipping line to use a shade of buff as a funnel colour. The Orient Line and Norddeutscher Lloyd used an entirely buff funnel without the black top, while Canadian Pacific and the Swedish American Line employed a buff funnel with a representation of the company's house flag on them.