Quote Originally Posted by MDR View Post
Check your watersupply maybe it is contaminated. Do you feel the spot if touch the negatives (slighe elevation)?

I've always used deionised water for dev, stop and fix and final rinse (wetting agent). I've only used filtered (5micron) tap water for washing.

Yes, I feel something rough when I pass my finger on the negative. Something like etched emulsion where these spots are.