I still think it is extremely unlikely that MiG-15s during Korea were painted according to BS 381C. In fact, also looking at the discussion on scalemodels.ru to which Kari referred, there is some acknowledgement that Soviet manufacturers would possibly have tried to accommodate foreign clients if they specified a colour based on BS 381C, but that is about the only case where such standards would come into play - and that probably only in later years, not the 1950s. In fact, unless someone comes up with Soviet-era instructions referring to BS 381C for domestic use or factory workers stating unequivocally that they did indeed use it as a standard, I seriously doubt this new "revelation".