It was found that any night fighter with black undersides could be seen from underneath at altitude. Stealth technology was not invented quite yet guyz.
the night sky was never purely balck as there was always some blue in it, the reason German nf's had an all blue underdies till 1945 when the German nf's were poised to do night ground attack. Then some a/c had a black undersides. The Bf 109 at first was painted black in 1941 as all 110's and Ju 88's, Do 17's and 217's were until a blue-grey base camo came into effect. Having an a/c at extrememly low altitude in black was not a bad idea as it could not be picked out at the horizon except for it's sound of the engines, and as I have said in a couple past threads the Bf 109G's did quite well agasint the Mossie LSNF and intruders, more so than the He 219 with only 12 kills, a couple of them debateable.......
Erich ~