Normally in print film, clear strip indicates the film was never exposured to light, in slide films the film would be black if there had been no exposure, when I was working in the lab, even a roll of traditional B&W that went through the c41 process by mistake had images on the film, and of course we all know about cross processing both c41 and e6 films, but again, the only time I have seen c41 come out clear with the edge writing still on it, is when it had not been exposed and then processed, I have done that with mine more than once over the years, I have never worked with scala, so I can't say about that roll.