White was done away with, on upper-wing surfaces, so as not to compromise the camouflage. Merging with the background, while parked, was of paramount importance, so any reflective colour was unwelcome (propeller blades went black for the same reason.)
Yellow was added to the fuselage roundel to make it stand out from the camouflage, but only as you got closer; it was soon found that the yellow and white, on bombers, was too reflective in searchlight beams, so the rings were made thinner, and fighters eventually followed suit.
In Europe in 1945, recognition became critical, so the white was put back into the upper-wing roundel, with yellow added as well, in some cases (though the Air Ministry were not happy, but they eventually yielded.)
Yellow was added to the fuselage roundel to make it stand out from the camouflage, but only as you got closer; it was soon found that the yellow and white, on bombers, was too reflective in searchlight beams, so the rings were made thinner, and fighters eventually followed suit.
In Europe in 1945, recognition became critical, so the white was put back into the upper-wing roundel, with yellow added as well, in some cases (though the Air Ministry were not happy, but they eventually yielded.)
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