" one day our airfield at Deelen was raided by P-47s - their cowlings were also finished in the chequer board scheme. Because of this the airfield flak failed to open up on them - they thought they were our own aircraft- and the P-47s were able to strafe the field entirely unhampered...following this debacle our Fw 190s quickly had their checker cowls over-painted .."
It is therefore difficult to see how these cowl colours could be anything other than black/white - after all why should they be? Fw 190 Experte (NB 'Experten' is the PLURAL form) Peter Rodeike who covered this subject in an article in German magazine Jet & Prop (issue 4/03) is of the same opinion. In his piece Rodeike quoted ground crew testimony from Michalski (above) and states that " no former JG 1 personnel could recall any colour combination other than white/black as ever being used on JG 1 Focke-Wulfs ". Pretty categoric. He further states that information on yellow and red coloured chequers stem solely from 'interpretations' of archive film images held by certain US 'experts' and authors (if I'm being unkind he could have perhaps added 'with decals and books to sell'). 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 the Fw 190 "White 1" (or "4") assigned to Bernhard Kunze, 1./JG 1, WNr. 410055, showing an oil smeared cowling giving the impression of a shade darker than white, obviously (incorrectly) understood as yellow. A 1./ JG 1 Fw 190 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./JG 1 used yellow/black chequers. He suggests the black checkers/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...

Commentary from Bernhard Kunze's nephew on the JG 1 checker cowl colour issue on this blog
http://falkeeins.blogspot.co.uk/2013/03/one-million-page-views-since-september.html