 By the end of the war this had become standardised as the so-called "night roundel" of blue and red, that continued to be used on the dark NIVO green camouflage of post-war night bombers.Most RAF aircraft now had a silver finish (bare metal or aluminium doping) so that the national markings were conspicuous enough without outlining.During the late 1930s, RAF and FAA aircraft were once again camouflaged, and a new outline was introduced, this time trainer yellow, and the same width as the blue and white rings.