dark spots on my images

[sanmich]

I've noticed a lot of defects on my last batch of negatives, some of which appear as black spots on the image, which means that it's not something (dust) added to the neg, but rather the image actually missing there. the worst case can be seen in the image crop attached (this one's really the worst)

What can cause this? I thought of a bubble, but it doesn't appear to be round enough. Then what??

definitely having a :bang::bang: day...

 

[Dwig]

I've noticed a lot of defects on my last batch of negatives, some of which appear as black spots on the image, which means that it's not something (dust) added to the neg, ...

... but it could be dust or some other schmutz on the film at the time of exposure. A dirty camera body, especially one with flaking paint inside the body, could cause such problems.

 

[oftheherd]

What do they look like on the negative?

 

[ZeissFan]

Dust on the negative would appear white on the scan. So a black spot on a print would be a loss of emulsion on the negative.

 

[John Bragg]

Hi Michael. How about this for a theory ? Prolonged wet time causing localised separation of particles of emulsion which then adhere to the film again causing simultaneously, white and black spotting ?