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Old 12th June 2022, 03:58 PM
Phdgent Phdgent is offline
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Default Bergger pancro in bergspeed: Unseen base fog

I just tested a new to me B&W film, the Bergger Pancro 400 in 120 roll, twice actually...
The developer was the Bergger Berspeed and I used it as prescribed: prewash, dilute 1+1, 8 min @ 24°C with the advised agitation and finish as usual.

The 5 litre stock dilution was mixed two days before, in demineralised water, while carefully respecting the imposed steps, left it stand in amber bottles so it could 'acclimatise' a bit, anyway it should keep for 4 months.

The first test came out wel developed but showing a very dense and 'ugly' base fog.
As I am far of being perfect and commit mistakes regularly, I tested again, carefully paying attention.
Alas, the same 'ugly' and too dense base fog came out.
I held the lead in of the film against a 0.3 ND filter, I use these in the enlarger to lengthen the exposure times so to have the time for carefully dodging and burning (*), and the film's base looked even a tad denser.

The film isn't expired, and was bought a week before and kept (by me) at room temperature.

In the 48 years of darkroom practice, I have never seen this dense (and ugly) fog on a film exposed and processed at 'box speed', unless I made a mistake...

I haven't printed nor scanned the negatives as these aren't fully dry yet.

Does anybody has an enlightening thought?

(*) printing at F 8 with a Rodagon is sacred to me.
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Old 12th June 2022, 05:03 PM
Michael Michael is offline
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I found that Pancro needed extra fixing. Maybe try re-fixing (for longer) one of those rolls? If you still have any undeveloped cut-offs, try one in fixer to see what the actual clearing time is.
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Old 12th June 2022, 06:46 PM
Mike O'Pray Mike O'Pray is offline
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I have never used it so can't really offer much except to give a link to a presenter called Greg Davis, known as the Naked Photographer who tested a whole range of films including Bergger Panchro where he mentions that compared to Kodak Tri-X it has a much higher base fog

Here's his link: https://www.youtube.com/watch?v=2hCi...eMjzx&index=15

Go to 3 mins 30 secs and watch for the next minute or so for his comments

Also look at Rene B.'s comments underneath the video

Mike
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