Xtol as a Colour Developer?

Discussion in 'Color: Film, Paper, and Chemistry' started by Athiril, Feb 25, 2010.

  1. Athiril

    Athiril Subscriber

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    After some discussion on flickr, one guy said Xtol was forming colour on at least on layer, asked him to do a test to confirm.

    Here is his result - http://www.flickr.com/photos/richard314159/4381406063/

    This would explain why I could not use both Xtol or Rodinal as a first developer for E6 earlier... but doesn't explain why both work brilliantly as first developers for E6 when run hot (38-40c).

    Kinda odd
     
  2. Kirk Keyes

    Kirk Keyes Member

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    In reversal processes like E-6, the first developer simply develops the film in preparation for the reveral developer processing where the color in the film is generated.

    See this page:
    http://en.wikipedia.org/wiki/E-6_process

    Note the use of CD-3 in the color developer - that's where the magic happens!
     
  3. Athiril

    Athiril Subscriber

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    That's not an on topic post. I do not know why you would think I need a basic breakdown of the process given my post, if you read what I said it indicates I have experience running E6.

    This topic is about Xtol forming colour dyes, which I didn't think it was able to. But from my experiments running Xtol cold (20c) on colour film, getting good developer silver negs at inspection, then opaque positives after reversal, this would be an explanation, as the exact same thing happens with Rodinal cold in colour reversal (Rodinal is a known colour developer), but both work as a first dev for reversal when hot.

    Plenty of other chemicals also are capable of forming colour, Aminophenol (Rodinal) is a colour developer, it forms colour dyes across all layers, as does Phenidone and Metol.
     
  4. tiberiustibz

    tiberiustibz Member

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    Interesting to know. I wonder if you could develop first in hot rodinal, and then in cold rodinal to make a positive...
     
  5. Athiril

    Athiril Subscriber

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    A while back I was trying to use rodinal to make colour negs, had some success, but they were extremely thin was bleached and fix, best results are generally partial bleach bypass, with little colour close to being monochromatic (most image coming from silver neg).
     
  6. AgX

    AgX Member

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    To be precise, you are talking about `primary colour developers´.

    It may be the use of just `color developer´ that lead Kirk astray.
     
  7. Kirk Keyes

    Kirk Keyes Member

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    I guess I don't know what a "primary color developer" is...

    So you're not substituting Xtol for the first developer in E-6 or using E-6 reversal film?

    Could you give a step by step description of what your developing steps are?
     
  8. AgX

    AgX Member

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    There are two ways a developer can produce a dye:

    -) as primary colour developer: forming colour by oxidation or by reaction of two oxidised developer molecules

    -) as coupling colour developer: forming colour by oxodation and subsequent coupling with a colour coupler.
     
  9. Kirk Keyes

    Kirk Keyes Member

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    OK - thanks for the definitions.