This is a weird one, but when scanning an old (1977) Super 8 film, I seem to have come across what looks like small cracks all over the film. I’m not sure what it actually is. Maybe someone from the forum has seen this before and knows what it might be, or even better, how to fix it if that is even possible?
Initially I thought this to be dirt, so I ran the film through a microfibre cloth with a bit of film cleaner. This didn’t do anything with regards to the “cracks”. I may have been overly careful, though, because it also barely reduced dust and this was my first time actually physically cleaning a film. My best guess now is that we might be looking at cracks in the emulsion (which wouldn’t be fixable?). I read that reticulation as a result of strong temperature changes during development can cause such cracks, but I don’t think that this is the case here because, with the film being Kodachrome, I think it is safe to assume it was developed properly in a professional lab (all films from the same trip were stored in a Kodak return box).
Here is a scanned frame that shows the effect I mean. You might have view the image in full to see it properly.