Many thanks Andreas 
I'll drop you a pm with the details
Paul
E-Mail sent 
Many thanks for taking the trouble to copy and send that over Andreas. It is indeed a fascinating read and confirms the Du Doch scheme is likely to have been red and white stripesrather than black and white (as sometimes interpreted) I was really interested to see a couple of points made -
i) Diary extract by Lt Preuss which describes his encounter with Udet flying a red aircraft which performed much better than his own which is likely to have been the D VIIF on an evaluation flight since it was after Udet had bailed out of his earlier aircraft.
ii) The suggestion, (which makes perfect sense to me), that flight leaders would have had both main and reserve aircraft painted in similar colours to make identification easier (which also supports the idea of red and white stripes rather than black and white to avoid confusion with Hans Kirschstein's DVII flown at a similar time)
Overall clear as mud
Still I think there is enough information to imply (if not confirm) that a red and possibly a red and white striped wing
may have been fitted to the DVIIF . . . .
Cheers
Paul