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I've been away from here for a bit, as life got in the way of all things film related. However, I got back on it and managed to shoot a bunch of film over the past few weeks.
On Saturday I picked up some new chemicals (Rodinal and Fix) and yesterday set about stand processing two rolls of 120 (1x Pan F, 1x FP4) in two separate tanks, at the same time.
And this happened, to both films. The stripes are worse on the Pan F, but they're still there on the FP4!
Here are as many details and thoughts that I can think off as to how I managed to get such regular weirdness using a process that I've tried and tested countess times (*apart from one new thing, see below)
--
Box Brownie No.2 Model F
Ilford Pan F 50.
Exposed 20180709
Processed 20180722
Semi-Stand processed for 1 hour
Rodinal 1:100 (5+500ml)
(30secs inversions then 5 inversions at 30mins)
5mins wash
5mins fix.
*Chemicals all brand new that day.
It's not squeegee marks.
It's not in camera.
-I have the same effect, but to a lesser extent on a separate roll of FP4 from a separate camera that was processed exactly the same way.
My thoughts:
1: Temperature Fluctuation while developing. I was trying what I thought was a steady 20deg supply from a mixer tap . But it seems to uniform.
2: Air bubbles. But I gave the tank good bang each time and I've never had a problem with this before.
3: Slight agitation throughout process. I noticed that the tub I was using for a water bath wasn't quite large enough for 2 tanks. So they may have been slowly rocking in the moving water (see #1)
4: Wetting Agent Contamination. This might be the solution to the mottlng in general but not the stripes. Would serious wetting agent contamination also contribute to more bubbles? (see #2)
--
Any suggestions or further questions appreciated!
On Saturday I picked up some new chemicals (Rodinal and Fix) and yesterday set about stand processing two rolls of 120 (1x Pan F, 1x FP4) in two separate tanks, at the same time.
And this happened, to both films. The stripes are worse on the Pan F, but they're still there on the FP4!
Here are as many details and thoughts that I can think off as to how I managed to get such regular weirdness using a process that I've tried and tested countess times (*apart from one new thing, see below)
--
Box Brownie No.2 Model F
Ilford Pan F 50.
Exposed 20180709
Processed 20180722
Semi-Stand processed for 1 hour
Rodinal 1:100 (5+500ml)
(30secs inversions then 5 inversions at 30mins)
5mins wash
5mins fix.
*Chemicals all brand new that day.
It's not squeegee marks.
It's not in camera.
-I have the same effect, but to a lesser extent on a separate roll of FP4 from a separate camera that was processed exactly the same way.
My thoughts:
1: Temperature Fluctuation while developing. I was trying what I thought was a steady 20deg supply from a mixer tap . But it seems to uniform.
2: Air bubbles. But I gave the tank good bang each time and I've never had a problem with this before.
3: Slight agitation throughout process. I noticed that the tub I was using for a water bath wasn't quite large enough for 2 tanks. So they may have been slowly rocking in the moving water (see #1)
4: Wetting Agent Contamination. This might be the solution to the mottlng in general but not the stripes. Would serious wetting agent contamination also contribute to more bubbles? (see #2)
--
Any suggestions or further questions appreciated!
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