I have encountered Strange Blotchy Marks along one edge of My 120 Negs.
Not happening on all of my films though.
Developer is Rodinal 1 to 50,
Paterson Tank 500ml of Chemistry.
30 inversions for first minute, 3 every minute thereafter.
Water for Stop Bath.
Fix 6 min's in Hypam.
Wash and Dry as Normal.
Film is HP5 and FP4.
Have processed Hundred's of Film's this one has me slightly puzzled.
Could I be over Agitating ???
Any Help Appreciated.
Camera is Pentax 67.
Some people claim it's something to do with the patterson reels. I don't know I never saw it when I used patterson reels. I used to invert for 10seconds every minute. I also used a fairly dilute developer [1:3 d23] and that may have been a factor. Maybe somebody can explain what it is with the patterson reels.
How about a better description of the marks, color, diffuse or hard edged, etc?
You can get marks on one edge, upper side in tank, from fixer being too low and leaving unfixed areas or having trapped air bubbles cause the same.
How deep into the frame are they?
I've used both Paterson and JOBO reels and have never experienced anything like that on *one edge* only. I'd suspect the volume of chemicals.
One thought - is there a possibility of left over wetting agent foaming and causing uneven devolpment/ fixing? Which edge is it - the lower or upper as the tank lies when not being agitated?
I'm going to check all of my recent film's.
I will get to the bottom of this and report back at a later stage.
It might actually benefit soeone else some day.
I think the cause might be foaming of the developer which I have noticed during agitation.Anyone Agree ????
I've had similar problems -I usually use PMK or another staining dev. Using fresh reels usually helps and make sure you rinse everything after use.
Just posted a picture in the non Gallery Section.
Showing the Problem.
Heading Negative Problem's.
That's what they look like, though as Les points out they'd be unusual on only one side.
If you are using plastic reels, are you agitating the tank via inversion, or by twisting the little handle? The twist handle has caused surge marks for me in the past, I now use inversion exclusively and have never had a problem since.
Paterson Tank 500ml of Chemistery as reccomended by Paterson.
I have even made a small plastic spacer for the centre column in the tank to make sure th Reel cannot slide up the column during Processing.
Agitation by Inversion method.
This problem has happened with Tri X Hp5 and Fp4 all in 120 doesn't seem to happen on 35mm.
It is happening with different developers Rodinal and HC 110.
Sometimes it is hardly visible on the Negative but shows up on the final Print.
I'm going to try mixing a larger volume of Chemistery maybe 600ml with less vigorous agitation and even be more thorough in washing the tank afterwards than I am already, although I think my tank washing is not at fault.
I was getting similar marks recently so I switched from inversion agitation to twirling and adding an extra 50ml (Paterson System 4 tank) and they've disappeared...
Since this contradicts some of the above advice, I think you just need to try a few different things to find one that works for you.