in a this web you cab see the colour of VVS
table of colors
Camouflage and livery paints for Soviet aircraft 1937-June 1940
the green is AII (zashchitnyi) gloss camouflage green, Akan 318, overall wooden, fabric (and eventually, metallic) uppersurfaces( I-15bis, I-16...),by info hobbyvista modelling the VVS research colours equivalence to FS 34066- 34062
Camouflage and livery paints for Soviet aircraft June 1940 -July 1941
AII Zashch. (zashchitnyi) gloss camouflage green, Akan 318, overall wooden, fabric (and eventually, metallic) uppersurfaces, equivalence to FS 34066- 34062
some types of planes of late 1941 seem to show a low contrast on the camo. This could be due to the use of stocks of earlier greens, and to the painting of very thinned black over green background.
Many Yaks seem to show a particularly high-contrasted camo. The reason is unclear. Someone hypothyzed the use of a lighter shade of green (ex. tractor green) or desert-style camos, but there is no any confirmation of this in documents and exhibits. Probably this high contrast is due to the use of only one layer of green instead of two over a yellowish primer/putty background, and to the use of sharp and well-covering black bands.