I was describing the black and white scheme used until 7th June 1940. The photograph dates from later when only the port wing was painted black. See my second post.

There was some variation in what was the port wing.

There are some post on Britmodeller regarding 1 squadron, and French blue undersides, which are interesting, and will link /quote later.

The photo quotes is very famous, often captioned as Crete 1941 IIRC, but what is not noted is that the Black/Sky boundary is the exact point the outer wing joins the centre section, so this could be a replacement wing from a black winged aircraft, rather than a non standard black/sky boundary.
It is also the only example I have seen of the colour change occurring in this place.

There is a famous photo of a VVS [Soviet] Hurricane showing a fuselage in temperate land scheme [Dark Green/Dark Earth/Sky] with the wing replaced with a Day Fighter Scheme one[Dark Green/Ocean Grey/Medium Sea grey]
picture at top of this thread
http://sovietwarplanes.com/board/index.php?topic=1441.0

Hope of interest
Troy