I didn't quite finish properly what i was writing because i was in a hurry.
When I was an exchange student back in the '80's i had a chance to meet some of the German pilots from the WW2 era.. At one of these "functions" I met Adolf Galland he was very accomodating, funny and gracious. He answered everyone's questions. He autographed a first edition book of , "The First and The Last" as well as a current edition of the book I had with me. Somebody did ask about camo patterns and he said there were modifications done to aircraft "in the field". As for colours they didn't pay too much attention. But he did say they quickly became dusty and dirty and were hard to keep clean as dirty planes did affect speed and performance.
Temporary camos like winter whitewashes and Desert tans were applied with mops, rags and brushes and the temporary washes peeled off quickly!!
He did field the question about drop tanks being available for the ME-109 during the Battle of Britain he said they were available but I forgot the reason he gave for why they were not used.
As for E. Hartmann I wasn't able to get to a meeting where he was present and regret not being able to make it.. He also was a class act and a fountain of Information. I wasn't aware that perhaps he had a bare metal bottomed ME-109, seems unlikely but never heard about it until it was mentioned on this FORUM.
The only bare metal 109's I am aware of are the late war defending the Reich 109's.
I always was impressed that he always wanted to be a Doctor was pre-med in college and probably would have been one of the great doctors of his day as his Dad was one too!!
War has a way of changing the fate of persons destiny.