I purchased Double Cross at theory11, but I just wanted to say this trick easily gets amazing
reactions. Difficulty I would put it at a 2. I'm sure people have talked about examining the marker,
but honestly I let my spectator do it, and not once have I had them figure out what makes it a
gimmicked sharpie. The price might seem high, but I guarantee it's worth every penny. Oh plus it
takes up barely any room to carry around.