Blue dominant in Cibachrome

Discussion in 'Enlarging' started by Inclanfunk, Jan 20, 2008.

  1. Inclanfunk

    Inclanfunk Member

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    Some of my ciba/ilfochrome have a light blue dominant in the white.
    I have one picture with a white wall and it takes a light blue dominant.
    I read here that it can be the dev temperature (to low).

    Can anyone tell me more?

    In advance I thank you,
    Julien.
     
  2. maxbloom

    maxbloom Member

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    How are you viewing the print? I had my lab do an Ilfochrome for me recently that has a blue tinge under fluorescent light, but warms up under daylight.
     
  3. Wayne

    Wayne Subscriber

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    Are you talking about freshly made prints?
     
  4. Inclanfunk

    Inclanfunk Member

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    Thanks for your answers.

    I'm talking about dry prints that I look in day light.

    If anyone has a clue?

    Thanks,
    Julien.
     
  5. boyooso

    boyooso Member

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    What kind of fluorescent lights are you looking at your prints under? I would recommend high quality daylight bulbs... that could be a problem.

    But it could also be a problem with the chemistry. My recollection is a overly potent bleach will give your prints, highlights more so a cyan cast.

    Corey
     
  6. Inclanfunk

    Inclanfunk Member

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    Thanks, as I said I look my prints with direct day light (but no sun light).

    Does anyone experience that trouble or know the influence of low temperature on developement?

    Thanks.
     
  7. Wayne

    Wayne Subscriber

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    A cyan color crossover in cibachrome highlights is not uncommon. Which chemicals were you using (P3, P3.2?) and at what temperature? Is the paper fresh? Were you partially reusing chemicals? Was this your first batch ever printed, or have you been doing it for a while? I'm not sure it will help me answer the question but it cant hurt.


    Wayne
     
  8. Inclanfunk

    Inclanfunk Member

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    "Which chemicals were you using (P3, P3.2?)"
    P3.2
    "and at what temperature?"
    22°C
    "Is the paper fresh?"
    Out of date since 2 years
    "Were you partially reusing chemicals?"
    No
    "Was this your first batch ever printed"
    No

    I mistake the temperature from the beginning. The ilfochrome's doc start at 20°C when the doc with the chemistry talk about 24° at least. Then I will try at 28°C and reduce the exposure time.

    If you have another idea, I will take it.
    Thanks Julien.
     
  9. PHOTOTONE

    PHOTOTONE Member

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    If your paper is 2 years out-of-date, I think this may be the problem. Are you using a dichroic color head as the light source? Can you make some filter corrections at the color head to compensate for the blue cast?
     
  10. Photo Engineer

    Photo Engineer Subscriber

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    A blue color cast in Ilfochrome materials indicates incomplete dye removal. Incomplete dye removal can result from several things.

    1. Under development. Since development is related to layer order, less silver is formed in the bottom layers (C and M) resulting in a residual blue cast in whites.

    2. Under bleaching. Since bleaching is related to layer order as well, some dye can be left over in the bottom layers.

    If keeping were to be a problem, then silver fog is the result, and fog in dye bleach materials reduces dmax causing gray or colored shadows. Fog in Ilfochrome does not normally affect the highlights.

    PE
     
  11. Wayne

    Wayne Subscriber

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    Are the chemicals 2 years old too? Perhaps that led to underbleaching. If the paper was kept chilled it could be OK.


    Wayne
     
  12. Inclanfunk

    Inclanfunk Member

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    Thank you, I think you are perfectly right for the blue color cast as I realised I have not follow the correct temperature processing and doing so produce an under developement and bleaching.

    For the fog part (all over the image). What do you mean by "If keeping were to be a problem, then silver fog is the result..." I bet it is completly understandable for an american english speaker but in this case I am unfortunatly french. May you use other words for the same idea?

    Thanks again to everyone's participation.

    P.S: Are the dye in this order from top to bottom: Y-M-C ?
     
  13. Photo Engineer

    Photo Engineer Subscriber

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    Of course.

    If an emulsion keeps too long, it tends to form fog. This means that silver metal forms where it should not which is the unexposed part of the image.

    If such fog forms in Ilfochrome, it causes a reduction in the density of blacks. If it is even, they become gray, if it is not, then they become colored.

    Dye layer order is Y/M/C from top to bottom. This is the reverse of chromogenic color materials which is C/M/Y from top to bottom.

    PE
     
  14. Inclanfunk

    Inclanfunk Member

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    Hello,

    Could the low temperature explain that develloper and bleach cannot reach C layer?

    Thanks
     
  15. Photo Engineer

    Photo Engineer Subscriber

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    Yes.

    PE