Leading Japanese researcher Katsushi Owaki announced today that official Japanese Army documents reveal that the Nakajima Ki-27 fighter (Allied code name 'Nate') "97-Sen" was factory painted 'ash green' ~ JAAF paint colour #1 'Hairyokushoku' (ash green colour). He has matched a paint sample from the only survivor at the Tachiarai Peace Memorial to Munsell value 2.5 GY 6.8/1.3
The closest FS 595b value is 34424 with a DE2000 difference calculation of 2.7 (2.0 or less = a close match) but it is greener in appearance. The closest RAL value is 7032 'Kieselgrau' (Pebble Grey) @ 3.67 but that is greyer and slightly more yellowish!
Camouflage colours to be used on the Type 97 were described as 'Tawny', 'Indigo Blue' and 'Green', probably indicating the JAAF paint standard colours khaki iro # 33, sei ran shoku # 28 and midori iro # 21.
In 1970 Rikyu Watanabe and Dr Yasuho Izawa described the painting of the Type 97 as follows:
"The airframe should be overall mei-hairyoku-shoku (light gray-green colour) - a glossy gray that has a very slight green tint."