[kiernanmcgowan]

> do you know this definitively? was it in the book?

I can't really speak to this, which is why I have a (?) around the meaning of Blue. I can say that green, orange, and red have pretty obvious connections, especially given the context of the film taking place during the Irish Civil War, which directly followed the Irish War of Independence (from England, who wore red in battle).

If it helps assuage your fear, you can take a look at the meaning of the colors of the Irish flag to see context for green and orange.

https://en.wikipedia.org/wiki/Flag_of_Ireland#Symbolism