Side effect of stand development

Discussion in 'B&W: Film, Paper, Chemistry' started by Alan Johnson, Apr 19, 2008.

  1. Alan Johnson

    Alan Johnson Subscriber

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    Here are some scans I made to illustrate the differing response of films to stand development with respect to edge effects.The photographs are of a gray card on a black card.The scans show the black/gray edge and are about 2.5 mm of negative in height.
    With Adox 25 (same as Efke 25) and Tri-X there is a light line on the gray side,the edge effect.With FP4+ no edge effect can be seen,the gray is more even. IIRC, PE wrote this may be due to more iodide in these newer emulsions.
    I believe the main use of stand development is to increase tonal range but it appears to have this side effect with some films.Scans are not a perfect representation of the edge effects on silver gelatin prints,on which I can see some slight edge effect on stand developed FP4,but they give the general idea.
     

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  2. Lee L

    Lee L Member

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    Which developer(s)? What development times? What agitation pattern(s)?

    Labels on the images might be helpful too.

    Lee
     
  3. Photo Engineer

    Photo Engineer Subscriber

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    You are looking at the left edge of the wide line in the left attachment here. You cannot see if there is a 'peak' in the dark area due to density.

    The chart on the right, either negative or positive, will give a much more definitive answer, but this is certainly a good example you have presented.

    However, without a check with normal processing and/or another developer, we cannot 'prove' stand development did this.

    PE
     

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  4. Alan Johnson

    Alan Johnson Subscriber

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    Developer was Rodinal 1+200 ,agitate 1min then stand 90min 68F.
    Left image Adox 25 ,center Tri-X ,right FP4.
    Sorry about the lack of info originally, these are the first Mackie lines to be transmitted by the electric telegraph.
     
  5. Kirk Keyes

    Kirk Keyes Member

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    I would expect that Tri-X has more iodide then FP4+ since it has a higher speed. PE?
     
  6. Photo Engineer

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    I believe so, but I'm not sure due to the new sensitization.

    PE
     
  7. Alan Johnson

    Alan Johnson Subscriber

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    PE, all I have to illustrate the difference between normal and stand development are two Plus-X photos in Rodinal.They are Photoshop processed the same. Stand development (Rodinal 1+200 90m 68F) ,right thumbnail, gives more edge effect with this film I believe.
     

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  8. Photo Engineer

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    Alan;

    Thanks. That is very revealing to me. It does illustrate the effects of stand + rodinal and how it can differ from film to film. Thiis is a good illustration of why different people get different results, due to film, developer and technique.

    Thanks.

    PE
     
  9. Lee L

    Lee L Member

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    Thanks. I'd have guessed at the films correctly, but it's nice to have all the info.

    Lee