Hi Srecko,
..another area of Luftwaffe colours that is a real can of worms..there was a very long thread over on the luftwaffe-experten forum on this subject. Unfortunately I don't have the link to hand but basically I'm not convinced that the colours were anything other than black/white.
Peter Rodeike covered this subject in an article in German magazine Jet & Prop (issue 4/03) and quoted ground crew testimony stating that no colour combination other than white/black was ever used on JG 1 Focke-Wulfs. He further states that information on yellow and red coloured chequers stem solely from archive film held by certain US 'experts'and authors. In Rodeike's article one can trace two possible sources of the claims of yellow and red used.
One is a b/w photograph of "White 1" (or "4") of Bernhard Kunze, 1./JG 1, WNr. 410055, showing an oil smeared cowling giving the impression of a shade darker than white, obviously (wrongly) understood as yellow. A 1./ JG 1 a/c would have had white as the Staffel colour.
Thomas A. Tullis has on the other hand published an article in "Defenders of the Reich Vol 2", by Erik Mombeeck arguing why 1./JG1 used yellow/black chequers. He suggests the black chequers had been painted on an already yellow nosed a/c or even that the "power egg (entire cowl/engine unit) could have been borrowed from a third Staffel aircraft due to engine problems". Both explanations seem quite unrealistic to me and seem only to serve the purpose of defending a preconceived idea. Note though that sister Geschwader JG 11 did have solid yellow cowls on some of their Fw 190s.
There are some stills taken from a film also published in b/w in "Defenders of the Reich Jagdgeschwader 1 Vol 2", by Mombeek. The colour version of the pictures are published in the Jet & Prop article and clearly show some undoubtedly white checkers, while others have a brown/red tone to them. Studying the photographs closely though you can see that areas of the grass and trees in the background are tainted brown, so for me this is pretty unreliable evidence..as you can see from this still shot I've added from the article..
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