I believe I read on the Rev forum that the designer decided a black background
looked best. I do not remember reading anything about the design being printed on black fabric.
OK sublimation sounds good.
However, I just cannot believe that printing on black the colors show well on both sides!
Either they printed both sides or they printed on white Icarex where the final black background is also printed with the sublimated dye.
I'm with Ara here, although admittedly I do not know anything about the printing process so I could be completely wrong. However it's done, the kites sure look nice.
Edit: Remembered about a picture I saw of the printed kite skins before they were made into kites. Found it here: https://www.facebook.com/revkites/photos/pb.84309256569.-2207520000.1422243499./10152472898171570/?type=1&theater
Looks like a border of white fabric to me.