[bener]

"...the colour most westerners consider blue" - are your saying this because they have a different word for blue in other countries or because there is some sort of dispute over what is considered blue?

[zinekeller]

Neither, it's because of a (mainly) East Asian concept of "grue" (https://en.wikipedia.org/wiki/Blue%E2%80%93green_distinction...). This is also the reason why the Japanese traffic lights has the "bluest green" (according to the Japanese government) in use today (https://www.rd.com/article/heres-japan-blue-traffic-lights/).

P.S. Russians have a different problem with blue: there's no singular word that maps to the English "blue" (they have синий (siniy, darker shades of blue) and голубой (goluboy, lighter shades of blue)). To be fair, English has the reds going on here: there's pink (in some languages substituted with the local equivalent of "rose") and maroon (which is just replaced with "dark red", and is a worst offender since that the French uses it for brown!)