Forte Negafort Universal Developer Times

Discussion in 'B&W: Film, Paper, Chemistry' started by Jim_in_Kyiv, Aug 26, 2007.

  1. Jim_in_Kyiv

    Jim_in_Kyiv Member

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    I've checked out the Massive Development Chart, and it doesn't have Forte Negafort Universal Developer listed for the films that I wanted, and the times listed for Fortepan films don't even match those on the bottle.

    At the moment, I want to use it for Efke 25 and SFX 200. Is there anything listed on the chart that would be close enough to this developer to base my times on?

    Kodak managed to send some D-76 our way again, but only after I bought the Forte liquid. I'm familiar with D-76, but don't mind trying this out.

    Any help?

    Thanks,
    Jim
     
  2. Tom Hoskinson

    Tom Hoskinson Member

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    Jimmy, the Massive Dev Chart for 3+1 Negafort gives 9 min at 20C for Fortepan 200

    The Massive Dev Chart for undiluted D-76 gives 8 min at 20C for Fortepan 200

    The Massive Dev Chart for undiluted D-76 gives 6 min at 20C for EFKE 25

    http://www.digitaltruth.com/devchart.html

    Based on this information, I would use 6.75 minutes at 20C for EFKE 25 developed in 3+1 Negafort as a Time/Temperature starting point.

    Assumption: 3+1 Negafort is approximately equal to undiluted D-76 (Based on the Massive Dev Chart information).
     
  3. Jim_in_Kyiv

    Jim_in_Kyiv Member

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    Hi Tom,

    The information on the Massive Development Chart is part of the confusion. As I wrote, it doesn't match what's on Forte's bottle, which is sitting on my desk. So I can't yet make a decision on whether I can use D-76 numbers or perhaps something else.

    According to the bottle, at 3+1:

    Fortepan 200 ASA -- 7min@20C.

    Two minutes difference is quite a bit. Yeah, the easiest thing to do is to get off my duff and try it, but a clear answer to my question would help me to not reinvent the wheel.

    So, if we go by the first set of information, 6.75 minutes is suggested. If we go by the second (7min@20C) - would you suggest 7.25 minutes? Which figure - why?
     
  4. Tom Hoskinson

    Tom Hoskinson Member

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    Why? I decided to accept the numbers in the Massive Dev chart as a starting point. 9/8 = 1.125 and 6 x 1.125=6.75

    Jimmy, what I would do is run a test with a 24 exposure roll of 35mm Fomapan 200. I would rate the film at ISO 200 and expose each frame to the same subject (something with a good scene brightness range). I would develop half the roll for 7 minutes at 20 C. I would develop the other half of the roll for 9 minutes at 20C. I would use the same agitation method for both halves.

    Then I would visually evaluate the results and decide which result I liked best.

    I use both Foma 200 and Efke 25. I develop these films either in 1+100 Rodinal or in 1+1+100 Pyrocat, using semi-stand agitation.
     
  5. Jim_in_Kyiv

    Jim_in_Kyiv Member

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    Tommy - in short, get off my duff and try it, because nobody who has actually used these combinations has responded.

    The original query wasn't about Foma 200 anyway - it was about SFX200. The discrepency between the times on the MDC and the bottle was noted as source of my confusion, nothing more. I haven't seen Foma 200 in this country (Ukraine) in the 5 years I've lived here, though we do get the 100 on occasion at the Arsenal factory shop. We can get into why they build the Kiev 88 in Kyiv some other time.

    I've got rolls of SFX and Efke 25 shot and waiting to be taken care of, and given empiracally-based answers, I'd come to the same conclusion - I won't be reinventing the wheel by doing this and might be able to contribute a little to APUG by working with it.

    Thanks for the help, long live the Church of Rodinal!

    Cheers,
    Jim
    Kyiv, Ukraine
     
  6. Tom Hoskinson

    Tom Hoskinson Member

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    Thanks Jim and long live the Church of Rodinal!