Last night I read the article by Lance Krieg about this subject in the latest Windsock magazine.
From the article - the only genuine sample tested of the wing covering contained aluminium particles in clear dope (spray applied). On the aircraft the sample was from this presumably would have given a finish to the wings similar to the RAF post war silver scheme?
The article suggested (as I read it) that wooden fuselages may have had an oil based finish with aluminium in – I’m guessing that this could have resulted in a different tone.
The article also quoted a British report on a captured aircraft – it described the appearance as silver rather than grey.
After reading the article, my own view – for what little it’s worth - is if I was modelling the actual aircraft the sample was from I’d lean far more towards silver rather than grey, especially on the wings. It’s difficult to argue with the hard evidence of the dope/paint analysis. With weathering & a nod to ‘scale effect’ in mind I wouldn’t be looking for a bright silver finish but a definite silver’ish finish none the less.
Of course there’s the question of how typical the sample aircraft was (as the author says) but in the absence of any other hard information I’d be thinking it was typical of a factory finish for the DIIIa.
Silver or grey it’s a beautiful fighter.
Regards
Russell