Trivia: What is the most uncommon color found on a world flag?
Purple
Red
Blue
Green
The correct answer is Purple
So why is this answer correct? : Only two countries’ flags have purple on them — Dominica and Nicaragua, both introduced in the late 19th century. For most of history, purple dye was far too expensive to use on flags, so artists opted for more affordable hues. Queen Elizabeth I once banned the use of purple outside the royal family, in order to control spending.