Hello Anton Rabe and Servus,
great info
! I did not know about blue tactical codes with 7/JG 54 and also do not know the fotos you and Jim P. mentioned, as I only have the German publications of Barbas. The German video from Traditionsverband Grünherz has some very exciting colored sequels, but the only a/c I can conect to 7./JG 54 is a brown/green camouflaged G-2 with white (!) tactical code 2+~. This is one of the great benefits of this board - you can learn a lot only watching what other people contribute
Nevertheless those blue codes remain strange. The loss-reports of 7th Staffel have white codes from 1940 onwards well into 1944 and there is ample fotographical proof for white codes. This is especially true for the new brown/green G-2s with Gondelwaffen in summer of 1942. As you said: perhaps they used the blue codes only on white winter-camo.
Carl