Aviakolektsyia page 4 table of paints applied during 1937-40 period.
Same table is on page 26 of the original M-Hobby article just stating TUs in addition.
AE-9 (gray) was an enamel, AII al. (silver) was a nitro-cellulose lacquer. Enamels were applied to metal surfaces, nitro paints to fabric and wood.
These are proven facts directly related to the actual schemes, a/c types etc. This has been discussed here hundreds of times but I'm afraid that confusion persists
I've the automatic translation of those tables. The translation of the whole text of Aviakollectsia is still deplorably rough because someone promised to correct it years ago, but didn't.
Sv.ser. (svetlo seryi) Light gray Around 1937 Nitro-lacquers
AE-9 Light gray Around 1937 Enamels
AE-8 Silver 1938-1939 Enamels
So, this says that there were both nitro and oil light grey, and, I would add, both oil and nitro aluminium. If you add that nitro paints can be used both on fabric and on primed metallic surfaces, this led to the conclusion that planes could well have been of solid color, both grey and silver.
The first drawing of an I-153 with fabric surfaces in silver and metallic surfaces in grey was published, I think, on Scalemodels.ru not too much time ago; for what I know, none wrote that the same thing was valid for R-10, UT-1 and 2.
The discussion from which emerged that this was valid for the undersurfaces of planes with solid green uppersurfaces as I-15bis and many I-16 was made, for what I know, on this forum, and based only on photo. For what I know, all previous written sources write only about silver or only about grey, not about the use of both on the same plane. If I'm wrong, please find any of them.
What's stopping you to log-in on scalemodels.ru and ask Orlov? I did have my doubts and did just that (asked him) and he replied satisfactorily. How could he ignore doubts if he doesn't even know they, and what kind, exist?
You certainly know that I don't write Russian and he doesn't write English.
To me it's either reading, understanding and accepting (fully or to a certain degree) or reading and not understanding.
So, one that citicizes an assumption is one that don't understand.
But research, not a guess work! We've had more than enough of it from Mr.P. I for one would love to research but have no conditions for it. Until new information surfaces, either from Orlov or some other researcher, I trust, respect and am grateful for what has been published by V-O.
I esteem Vaklamov, Orlov and all those that made researches publishing their sources and conclusions. It's different for those that want to discourage researches.
Your preference is "photographic record". that's OK, but you have to accept limitations of that method - for example, you can not tell colours from b/w photos, even determining how shiny was the paint is problematic.
all sources have their advantages and limitations.
Photos are limited for a quantity of factors: being in b/w, uncertainties on the film and filter, etc. But are available in quantity and allow crossed comparisons. Besides, they represent real planes, not planes as they should have been.
Documents are important as standards sources. But they represent aircraft as they should have been. I's not sure that they were applicable to all situations. Besides, it's not sure that there is any document following to the known ones saying different things.
Specimen and wrecks are important, but it's not clear how they were altered by time. Besides, in some cases they are unique and don't allow cross-comparations. Some reconstructions of a color are based on one specimen that could have been misidentified. I know that one does what he can do, but they can't be considered sure. Besides, there are specimen that show unexpected colors.
Reports of veterans are easily imprecise... but how can be we sure? They have seen and flown things of which we have only seen photos and drawings.
The comparison of all souces raises many doubts that should be the starting point for some attempts of investigations. Denying it will prevent from clarifyig them.
Regards
Massimo