You've probably already checked this, but...
According to wikipedia:
http://en.wikipedia.org/wiki/Xerography said: |
 |
Ub Iwerks managed to adapt xerography to eliminate the hand-inking stage in the animation process by printing the animators drawings directly to the cels. At first only black lines were possible, but in the 80's lines in different colors were introduced and used in animated features like The Secret of NIMH.
|
 |
But to be honest I don't really think it's used that often anymore in the digital age
(Not that I would know... I went to an Animation school but didn't focus on Classical Animation)