It was photocopied onto the green patterned paper (by the government to prevent tampering) and then scanned.
Not that this will convince you, of course.
Well, no. That is not a possible explanation. You can’t take a color scan and a black and white scan of a piece of paper both at the same time.
If you watch Karl Denninger’s YouTube video, you will understand why what you suggest is impossible.
http://www.youtube.com/watch?v=2eOfYwYyS_c&feature=player_embedded