Quote Originally Posted by Jim Noel View Post
I have not used an acid stop bath in at least 25 years and have never experienced the problem you describe. However, I do know one of the causes of this problem.

If you put the reels in PHoto FLo youwill get the increased density along the edge because Photo FLo acts as a catalyst to the developer.
In order to remove traces of Photo Flo from the reels it is necessaryto scrub them in hot water with a toothbrush.
Jim, this is a very good point.

Photo Flo 200 contains an ingredient which is a mild developer accelerator. It can do its thing along the edges or more if not cleaned away well.

I should add that this is not true of all emulsions. It is unreactive with many types of emulsions. I have personally tested this and can attest to the activity/non activity depending on emulsion.