ColSebastianMoran
( IRL Richard Karash )
Blank? As in, clear? Or exposed? Important distinction. If the films are 100% clear no edge codes it sounds like you've mistaken your fixer for your developer...
Second this.
Blank, clear --> Probably hit the film with fixer first.
Blank, black --> Film was exposed to light.
And, no recriminations. I've seen the first, from a very experienced photographer.