Medium format development streaks

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Arg6442

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Iowa
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Hello,

I made a large batch of contact prints from the 10 or so rolls of 6x6 that I’ve shot and developed. Looking at the prints (and negatives) I’m noticing some streaks running down the frames.
I developed a few more rolls using techniques for more even development (agitating differently, mixing dev better, etc) and the streaks persist.
For whatever reason, I can’t shake the suspicion that it has something to do with drying. When I pull my negatives out of the chemistry, they look fine, though I can’t inspect super throughly while they’re wet. While they’re drying, it seems like the density streaks accumulate where the water is streaming off. That wouldn’t make sense though because the areas are of higher density on the emulsion, and the streaks are only on the frame.
For reference, my development process is:

5 min. presoak @ 68 degrees
9.5 min D-76 1+1 (for fp4, which I use pretty much exclusively)
30 sec stop
3 min rapid fixer
~2 min rinse under tap water
2 min permawash
~20 min rinse under tap water
~2 min rinse with distilled water + a few drops of photo flo

I use Patterson plastic tanks of different sizes, I don’t use a squeegee or my fingers, it’s made the problem worse in the past.

Can anyone point me in the right direction? What could I be doing wrong?
 

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Arg6442

Arg6442

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Sorry for the poor quality images, my scanner is broken so I have to use an iPhone camera.
 

Sirius Glass

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Welcome to APUG Photrio

Mix PhotoFlo according to the directions at 1:200 or 1:600 as labeled on the bottle. Do not wipe or squeegee. Hang and use a paper towel to draw off excess water from the corner.
 
Joined
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If you're referring to the increased edge density longitudinally along the film, then the cause is almost certainly your agitation scheme. FWIW, 120 film in small tanks seems to have this problem a lot. I spent an afternoon years ago exposing rolls of 120 film under the enlarger and then developing them with different agitation schemes, etc. until I found a system that worked for me. My solution was first to make sure that the tank was not completely full, just enough developer to cover the top of the reel, and then rather vigorous agitation (not quite cocktail shaking, but closer to it than I had suspected) for 10 seconds at least each time.

Best,

Doremus
 
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