Film emulsion

There's a multitude of emulsions available, even after a lot of them have been discontinued. Each one reacts a little differently to light, both in terms of requiring more or less light, but also in terms of reacting in various unique ways to light.

How to crossprocess, a beginner's guide18 years ago

While there's still ample availability of cameras, film, and people to develop it, everybody should give crossprocessing a shot at least once! I've written about it before; it's a great way to force yourself to not shoot completely realistic pictures.