There were two camouflage schemes used on the birdcage Corsairs:
Originally they used the same non-specular blue-gray (FS35189) over light gray (FS36440) as the F4F and other early-war aircraft.
Later, they switched to the tricolor as later used on the F4U-1A: non-specular sea blue (FS35042) upper fuselage, semi-gloss sea blue (FS25042) upper wing surfaces, intermediate blue (FS35164) vertical surfaces and outer wing panel undersides, and insignia white (FS37880) under surfaces.
As for the colors themselves, I think the non-specular and semi-gloss sea blues had a slightly greenish tint. Do NOT trust the Simmers Paint Shop RGB values! Non-spec and semi-gloss sea blue are the same color, the only difference is one is a slightly glossy color, while the other is matte (as indicated by the first number). For some reason SPS makes them two entirely different shades of blue