Quote Originally Posted by LucRoMar View Post
Indeed Thomas, as I'm new to all this I was wondering, I'll try and clean the back and insert before doing a new test roll
If the negs are scanned as an entire strip, feeding the negs through the scanner might cause damage like that.
Depending on how the film was processed, when it's hung to dry some folks like to use a squeegee, which could also cause a reasonably straight scratch.
But I would be suspicious of the film back.

That gives you some places to look.