Posted By:
AnonymousInteresting question. I believe the number of colors could in theory be limitless , although i am no expert and appologize in advance if this is not true.
I was interested enough to google it and found what i thought to be an interesting web page.
http://www.answers.com/topic/lithography
edited to add:
http://www.cycleback.com/printsexamination/twelve.html
edited repeatedly to try to fix links