The marks are completely random and absolutely all the picture frames in the entire roll have them. If film is observed at an angle under the light with the emulsion side up, I can see tiny dots on the film.....
I have seen something like these before and the slight orange tinge suggests to me that there may have been microscopic iron particulates in the water which oxidized (rusted) when the film was drying. That is what the diagnosis was when I last saw anything like them. Fitting a water filter stopped it completely. Actually the amount of dirt in drinking water is amazing!
I was going to say drying marks too, but I suspect Daniel is correct. I sometimes get odd stuff on the negs, and it nearly always comes down to crap floating around in the tank. The suggestion to filter everything is an excellent one. I would only add that you should always use distilled water for everything if you're having these issues. If nothing else, filtering and extreme cleanness will eliminate a lot of variables, but I think it will also solve your problem. Beautiful shots by the way.
The shape of these marks made me think at first insdtance of some transparent flitter layed down on the film.
However the fact that these marks at average have lower density speaks against that.
Could flakes of emulsion been laid upon one film by means of a wiper or sponge having them rubbed off bevore in a preceeding session or from the preceeding film from the same session?
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