Being accustomed to the idea of using green and mauve in the First World War, it seemed reasonable to me that the same scheme was used in the Second World War. Like in this boxtop picture
But I have been told that this mauve or rather violet color is a misrepresentation, the color was taken from existing machines in museums, but it is said the original pigment was actually brown, but changed into a purplish shade over time.
So, who knows?