What color is almost not on national flags?

News24xx.com - What do all flags have in common? - Absence of one color.
What kind? This color is Purple!

No country in the world uses violet as the primary color on its flag.
The reasons for this are purely economic. For a long time purple color was a great rarity and a status symbol.

It was very difficult to get. Previously, purple color was obtained from the mucus of sea shells. For example, in Rome, it was a symbol of status. Only in 1856 they were able to paint the textile relatively cheaply in violet. The formula was opened by the British chemist William Henry Perkin.

But there are still two flags on which you can find purple:

1) Parrot on the flag of Dominica.
2) And there is a little violet on the flag of Nicaragua. "A thin line on the rainbow!"

Congratulations!))