Hello Mike,
Problem with upper camouflaged wing of VOISIN, is that nobody know....until now. Myself I would be glad to have an answer....
Camouflaged upper wing is a supposition...
I have several photo of VOISIN flying and see from upper.....no camouflage, it is true also that these VOISIN are silver.....
VOISIN night bomber are gave as "black", here in France, some peoples speak of brown for fuselage and black for wings.... under I suppose....
For upper, if it was a camouflage, I will do it as camouflage of Nieuport, same schema and colors...
I am sorry MIKE, I was "living" with this VOISIN for several months, without details about this point ( also with a lot about other.....)
"Bon courage avec ce montage" and have a pleasant and "rich" modelling with this model...
When finished, a photo would be welcommed
Best regards and happy modelling.
Philippe JOURDAN