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Thread: Film Pre-soak

  1. #21

    Join Date
    Aug 2005
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    Los Alamos, NM
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    Has anyone really looked into how presoaking affects development. You would think that prewetting would make the emulsion more permeable to fluids, but that the accumulated prewet solution would also slw down penetration since the developer has to displace the existing liquid. How does presoaking affect development time to a given gamma, overall contrast, and things like that? We really need good experimental work, not guesses.

  2. #22

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    Sep 2010
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    Castle Rock, CO, USA
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    How is your water being filtered?
    A politician is a man who will double cross that bridge when he comes to it.

    Oscar Levant

  3. #23

    Join Date
    Nov 2002
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    Melbourne, Australia
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    For maybe 20 or 30 years I didn't presoak, and in fact had never heard of it. This for 35mm and 4x5 in an inversion tank. My agitation was vigorous for the first minute after a couple of sharp raps on the bench to dislodge airbells which I have not experienced since the 1960s. Then remaining agitation every minute thereafter. I gradually moved over the years to less frequent agitation after the first minute to control contrast.

    When I started to use 120 size (Neopan 400) I had a few random little circles of slightly reduced density, visible in prints in clear sky only (maybe 0.5mm diameter leading to a few mm on an 8x10 print). I became very particular about rapping the airbells and agitating fairly vigorously but I still got them. I started to use presoak, 2 min fairly vigorously, followed by dev as usual. The problem went away. I still don't have a good explanation, but it works for me.

  4. #24

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    Oct 2005
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    New Jersey
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    I have two 5 micron filters for both the cold and the hot. Thanks

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