Great idea...if it actually worked. I've tried every variation of rubbing the ink off that I can
think of and it always leaves residue or streaks. It's nowhere close to rubbing off in one swipe as
in the videos. Hell, even in the instructions you can see it doesn't always rub off, but they
cleverly edit the video so it looks like it does. I was super excited about this after seeing it on
the David Blaine special, but now I'm sorely disappointed.