Incendiaries were blue, but I doubt it'd be that particular shade. That's just a WHAG though. There's a short blurb about 'em here. Way down. Says the blue tip didn't appear until 1941.
http://www.smallarmsreview.com/displ...darticles=1622
Better picture here. Still away down.
An Introduction To Collecting .30-06 Cartridges - International Ammunition Association
Green is Brit AP.