Like I said in the other thread, it was a great read, and I really appreciate you putting this all together. I learned about interpositives and internegatives in college, but, unfortunately, it's not part of my everyday vocabulary anymore, so the terms sometimes get muddied to me. For that, I am thankful for the quick recap. That said, there was one part that I found to be a little muddied:

"This is called an Interpositive (IP), and is the second-highest-quality source of the film. Copying this will give us another negative image, however, so it cannot be used to make theatrical prints (the colors will be reversed). So it is copied, resulting in an Internegative (IN), which theatrical prints can then be made from (copies of a copy of a copy of the original negative)."

For some reason, I'm having a little bit of trouble deciphering that. I think it has something to do with the uses of the word "copy."