I just noticed this problem on my negs, as a few other people have. I had a problem sort of like this on my 4x5 film a few years ago, was told that it was a reflection from a part of the holder (don't know what it's called or how to describe it), and cured it by running a black magic marker along it. I'm going to try this with the film holder for the 6x6 negs - will report back if it works.
Barbara -- Barbara White/Architectural Photography http://www.barbarawhitephoto.com
