It might seem like a simple question and, to be honest, it mostly is. It might, however, depend not only on whether you consider maroon to be a shade of red so you can include Sri Lanka in the special category but also on the language you speak. Let’s take flags of Kazakhstan and France. Both have blue, right? Well, if you speak Russian, you might say these are different colours because light blue is often seen as a separate colour in Russian, not as a shade of blue. Of course, there is teal or cyan in English but they are not as widely used as the Russian word for light blue. If you are interested to learn more about colour names in different languages, particularly, how they develop, check out this cool Vox video.
As usual, comment if you like the map and if you have any requests/ideas – you’re welcome here.