Film development came back with damages

[Dito4ever]

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For a few months now, I've been shooting analog again (after over 30 years).

I'm a bit frustrated with film development. My introduction to analog photography began with a vacation and about 10 different exposed films.

The negatives and slides came out of the development process quite scratched. Scans were horrible. I even got my money partially back.

Now, on another trip, I shot 11 slides. I got them developed yesterday. At first glance, 8 films looked fine (Kodak Ektachrome). Three films (either coincidentally or not, Fuji Velvia) had damages on the back. It looks like stone chips on a car. Plus some scratches. (See the pictures: photo of the slide projection and the slide itself).

Do you know how/where this damages occurred?

I can only imagine the development process as the cause. I had the development done at a reputable lab.

Thx!

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[oldwino]

While I can find emulsion defects on every roll of film I have shot (if you look hard enough), these do seem to be excessive.

I would speak with the lab about it, in a friendly tone, and see what they say. It might lead to them finding a fault in their system. 

[250swb]

They do look (maybe) like stress marks where the film has been passed over a roller with some grit (more like a rocks) embedded on it. But unless you've rotated the images yourself the scratch in the close up photo seems to be on a diagonal track, which a machine made scratch can't  do? So see if you can find a matching or very similar  pattern of 'dots' in other negatives further along the film which would then point to a development problem given the repeatability of them.