Red green colour blindness is why the British electric wiring (flex) colours were changed in the 1970s from red-black-green for live-neutral-earth to brown-blue-green/yellow(stripe). Imagine mixing earth and live up in a plug!
Fixed wiring changed to suit just a decade ago and is now a European standard.
I think the choice of a spiral stripe on the earth wire was to make that identifiable with limited colour vision, but not the rest of the colours. That new earth colour may even have been introduced here before the other changes.
I think I can see the logic of all the colours chosen, based on the idea that the main objective is to ensure the earth wire (and so the casing) gets connected to earth (this was before built-on plugs). Provided the right wire is connected to earth, which wire inside the device is live and which is neutral should not matter. So the new earth colour should be right in as many countries as possible (hence green, I think) plus its helpful stripe. The other two colours must not be used for the earth anywhere, or else someone might reason (as I just did) that that one must
be earthed and the other two don't matter.
Both black and read were earth colours (red in Germany), and light blue wasn't - I think the French may have already picked that for neutral. I've always been surprised that brown wasn't used for earth somewhere, and I've just heard it was - in Britain, pre-war. But there were so many systems in use then, that I think only the national standards were considered.
The European agreement to change the colours for appliance leads was made as long ago as 1968, so before the UK joined the EEC. Its implementation was spread over the next ten years, so it overlapped with our EEC membership. The reason was of course to support a "single market" in appliances (still long before the European Single Market), while removing the obvious hazards.