My father was a college professor, and for many years he'd make slides to use for lectures (these were photos--not a text outline of the lecture like someone might use PowerPoint for). He processed the black and white slides himself. He did prints at least occasionally, as well. I remember spending part of a school holiday when I was maybe 10 or so while he made some prints. I might have seen the whole process from photographing the source material to the finished prints, but I can't remember for sure. But I'm pretty sure it was a fascinating day.