I remember hearing of a tale from a German night fighter ace about how to tell at a distance which sides aircraft had been shot down. The British aircraft would burn yellow and red because of the fabric used in the bombers (don't know how it went later in the war with all metal aircraft). German aircraft burned white, as there was a lot of magnesium alloy in the engine construction.
I know that B-29 has a lot of magnesium alloy in the aircraft, especialy around the engines, which caught fire on a repeated basis in earlier production aircraft.
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