Found this little ditty on highsnobiety :
"In collaboration with Calvin Klein Collection, Visionaire is about
to release their latest issue - Visionaire 56 Solar. Once again
Visionaire impresses with an innovative take on publishing.
This special solar powered issue of Visionaire Magazine uses
innovative printing technology that instantly transforms black and
white artworks to vibrant colors when exposed to direct sunlight.
Contributing artists include Yoko Ono, Richard Phillips, M/M (Paris),
Udo Ronginone, Alex Katz, David Sims, Ryan McGinley, Richard Burbridge
and more.
Above and after the jump we show you some of the works and you see a
clear difference between the actual artwork and the work when exposed
to sunlight. The effect is truly amazing and the idea and vision by
Visionaire once again exceptional.
Visionaire 56 Solar can now be pre-ordered on the Visionaire homepage ."