Yeah Nolan said in an interview that he had blood ready to go for that scene...but decided not to use it because he thought that the smeared make-up effect was a better way to show his wear & tear.Hm. Interesting. I do recall hearing that there was supposed to be a bloody Joker in the interrogation room scene.
(Though I think Joker needed some blood on him after he gets hit with Bats' armblades. It doesn't make sense for him not to have any blood.)
Thanks!lol Mr. Earle your sig is hilarious!