This schematic on the subject of Aichi B7A2 (Navy Carrier Attack Bomber 'Ryusei') colours was prepared in response to another private request and may also be shared here. The colours are as measured and recorded on the surviving NASM example by Robert C Mikesh and documented in his article 'Japanese Aircraft Colors at NASM' which appeared in Vol.3 No.1 of the Asahi Journal and also in the B7A2 feature of his book 'Japanese Aircraft Interiors 1940-1945' (Monogram Aviation Publications, 2000).
In Asahi Journal Mr Mikesh noted that the cockpits were "full of parts and very dirty from earlier outdoor storage" therefore no measurements were made. In his subsequent book Mr Mikesh assessed the cockpit interior as "severely weathered and oxidised" but nevertheless recorded the colorimeter measurements shown here.
The upper external surfaces appeared to be a very dark and greyish green (black green) that corresponds closely to the Kariki 117 colour standards 'D0' or 'D1' which Ryôichi Watanabe has also compared to FS 1/26081 and the Luftwaffe RLM 74 (Arawasi magazine Issue 9 Apr-Jun 2008).
The external lower surfaces are a cool, neutral grey very close to FS 36293 which is just slightly darker. Whether this surface is oxidised/chalked and would reveal a warmer "olive grey" if rubbed back is not mentioned and is unknown.
Mr Mikesh compares the main interior colour from two measurements as being close to the standard Munsell 2.5 G 3/2. In fact this is not the closest value, @ 5.91 and 5.44, but rather those are 10 GY 4/1 @ 3.99 and 5 G 3/1 @ 1.97 respectively. However, I concur that these colours may represent a faded and oxidised N2. The closest FS 595b values to the actual colour measurements are 34092 @ 3.12 and 26081 @ 3.14 respectively.
The armour plate behind the pilot's seat conforms to this general colour but again the standard Munsell value of 2.5 BG 4/2 cited by Mr Mikesh is not the closest @ 5.91 but that is rather 10 G 4/1 @ 3.62. The closest FS 595b value is 34092 @ 4.16. This is even more indicative of faded N2.
The instrument panel appears brown and measures as such in Munsell but Mr Mikesh feels that this colour is a very badly degraded N2. The dark brown colours as measured are included here but again Mr Mikesh's preferred standard Munsell value of 5 YR 2/1 is not the closest @ 2.71 & 4.65 but those are rather 7.5 YR 2/1 @ 2.49 and 5 YR 2/0.5 @ 2.71 respectively. The closest FS 595b values are 37056 @ 3.45 and 37031 @ 2.04 respectively.
Although not specifically mentioned, wheel wells and undercarriage doors on 'Ryusei' appear to have been finished in the translucent blue-green 'aotake'.
Courtesy of Mark Smith a link to an interesting 1/48th B7A2 modelling article by Milton Bell is here. This article mentions that the bulkhead between the two cockpit positions is 'aotake' as indicated by the Shigeo Koike box art. The Mikesh book photographs do not appear to show that but I believe that Mr Mikesh would have noted it if that were the case. Unfortunately we do not know the source of Mr Koike's information.
Images credit: Rendered colour chips © 2009 Straggler incorporating original Kariki 117 paint standard plates.