During WWII the RAF painted its photo-recce planes dark blue so they
couldn't be seen.

First off, it's sort of an electric robin's egg blue - not very dark, and
secondly, very few of us are flying at 40,000'.

Very few Hurricanes did either.

all the best -- Dan Ford
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see the Warbird's Forum at www.warbirdforum.com
and the Piper Cub Forum at www.pipercubforum.com