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Looks like the most dangerous evil to film users
Insufficient agitation in the first 15 seconds , creating uneven development.
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If it is somewhat regularly happening, then I suggest you try turning your film 180 degrees for a few sessions. See if it is positionally related to the way you agitate/load/who-knows-what. If it follows the film substrate, suspect some kind of damage to the film. If it stays in the same position relative to the tank, look there.
If it happens irregularly, you may have a tough time investigating.
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