Another example of Ki-27 colour comes from an extant rudder in the collection of the Hiko Jinja (Flight Shrine) in Yahata City, Japan. Owaki-san has very kindly provided a photograph and the measured Munsell value of 7.5 Y 7.5/1.5
The closest FS595b value is 26559 @ 1.62 which is almost identical (2.0 or less = a close match) whilst the nearest RAL value is 7032 Kieselgrau (Pebble Grey) @ 3.20
Owaki-san notes that this example is doubtful because the kanji characters painted on the rudder refer to a Navy unit at Otsu air base on Lake Biwa north of Kyoto. This base was associated with Navy seaplane training - maybe the rudder was from an Army Type 97 fighter- trainer that crashed or force-landed there?
In 1970 Dr Izawa commented "Some Type 97 fighter-trainers that had their spats removed were painted in a cream-gray".
Image credits: Photograph © Katsushi Owaki Collection
Rendered colour samples © Straggler 2008