Quote Originally Posted by brianmquinn View Post
A simple test for edge marking stability might be to get a fresh roll of Pan-F and leave it unexposed.

Every time you develop an exposed roll of Pan-F just include a inch or so of the unexpoded roll in the tank. As long as you use the same devloper and time each roll you may see the edge marking fade over time on the unexposed roll.

A question; Are the edge markings, "in low exposure areas"?
Better than an unexposed roll shoot a step table 36 times and use a 3 inch clip in the tank each time. With 3 inches you should get all of the steps visible each time (plus the edge markings). There is no way to know exactly when the edge marking were put on the film but we would know the date of the step tablet images.