You look at a map of the world in 1900, and the British Empire will usually be in a light red or pink, France will be a strong blue, Germany will be one form of grey or another, Russia will tend to be green, etc. I know these are only a few examples from one context and not absolute, but there does seem to be trends for a country to identify themselves with a certain colour or two over all others.
So I'm asking, what are the reasons why some of these countries came to identify with these colours specifically? Why did the Netherlands end up orange? Why is China red? Ireland emerald?
Thanks for any responses
hi! this won't answer all of your examples, but FYI, you can get started on this section of the FAQ (link on sidebar):
While I definitely support Searocksandtrees' link to our FAQ section on flags, colours & symbols, I fear you will not be entirely satisfied as your question (if I understand you correctly) goes more into the direction of "Why does political geography consistently paints country x in colour y?" -- And it is an interesting question!
First off, political geography often simply makes use of contrasting colours for obvious reasons and countries are not necessarily painted in the same colours all the time. For example the world map in my own room uses a totally different set of colours. On this one Russia is orange, Germany is light blue, and the United States is green. It just follows a pattern that ensures that neighbouring countries have constrasting colours to better distinguish them and you will find this pattern in many political maps (examples: 1, 2, 3).
However, I do see your point. Oftentimes we do associate certain colours with certain nations especially on maps and they do not necessarily overlap with their flag colours. We can see this not only on political-historical maps of colonial empires, but also in various modern "historical" strategy games with which I have plenty of experience. France tends to be coloured blue, Germany grey or white, Imperial Russia green or golden, Soviet Russia red, Britain red or pink, Spain yellow, the US blue as well etc. And if you look at national sports teams you can often see the same tendency in their clothing.
I don't know the answer for every single one, but perhaps I can shed some light on some of those you mentioned:
I will not comment on the red Britain, blue France, and green Ireland cases as I can't answer them confidently enough and this post is already more speculative than what I would normally consider appropriate for our subreddit.
/edit: Added some stuff.