What is intermediate blue?

Modeling Subjects Aircraft
1

was it an actual color that was produced or a mix that was created in the field?

2

I believe it was an actual color, but the shade would still vary.

3

It’s an actual color. For WWII era, reference ANA608, currently FS35164.

Regards, Rick

4

Here ya go check this link.
http://www.jpsmodell.de/dc/shemes/usn43a_e.htm