I don't usually use Pyro (PMK) for processing 120 roll film but yesterday I decided I'd give it a go with a roll of TMY I shot under foggy conditions, as Pyro is reputed to be good at enhancing atmospheric effects like fog, making them more "tactile". While I do like the look of the images I got, I'm disturbed to discover that the negatives have some subtle spotting/mottling in the higher values. Here is an example. The marks are most evident in the upper right and left corners of the image, as lighter spots:
A larger version can be viewed here to see the marks more clearly: https://c1.staticflickr.com/5/4899/3...28c1931d_k.jpg
Any idea what is going on here? Did I do something wrong?
I followed the directions exactly as written in the instruction sheet that came with the chemistry (Photographers Formulary PMK, 2 part solution) using a distilled water stop, the T4 fixer (made fresh) plus a final 2 minute immersion in the developer AFTER the fix. (Which I gather is no longer deemed necessary). Final wash was 20 minutes at 72F, and rinse in distilled water plus a few drops of Photo Flo at the very end. I did a 3 minute presoak in distilled water as well, and all solutions were within 3 degrees F at all times. I've used this exact procedure with other films and never seen this mottling before. This is the recent batch of TMY dated 2021 I believe. It has been stored at room temperature in dry conditions for about 14 months before I shot the roll.
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