Quote Originally Posted by Francesco
What is the most common mistake that results in the development of a completely blank piece of film?
When you say "blank", do you mean that the negative is completely clear or absolutely black?

The only thing that I know of that will result in a completely clear negative is placing the film in fixer first - before the developer. Not that *I've* ever done that before ....

Complely black with no indication of a border of any kind - exposure to light before loading the film into the camera - with a "border", excessive overexposure - shutter stuck open or something like that.