Hey guys there is a trick which david blaine performs in his 'What is magic' tv special. The trick is at around 5:17 in this video http://www.youtube.com/watch?v=IJ-r1WW5z-U At the end there is a gaffed card which looks as though the spectator has smudged the ink using their finger. If anyone could tell me where I could purchase the gaffed card, or instructions on how to make it etc. It would be much appreciated, thanks in advance.