I shot my first colour film in LF recently. I've had no problem with BW, wich I process myself. These colour plates I sent to the lab, and they came back like this (see attachments).

What do you think those red stains are? The look like light leaks to me but, did they happen during the loading of the holders (at home), or after the film was exposed (either at the lab or at home? They dont seem to have happened during exposure in the camera, since the actual image is perfectly sharp and exposed. Could it be due to faulty film? Xray eposure upon shipping to/from the lab?

This is the first time I use this lab for LF (I used them a lot for MF), so maybe they are not that used to big pieces of film. What is your expert opinion?

Thanks so much!