Tetenal Hardener and fixers compatibiloty

Discussion in 'B&W: Film, Paper, Chemistry' started by Tofek, Jul 30, 2013.

  1. Tofek

    Tofek Member

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    Hello,
    I bought some Tetenal Hardener to add in Ilford Rapid Fixer, but I just read on the net that those two aren't compatible. Does anyone know what fixers are compatible with this hardener ? And just for curiosity, why some aren't ?

    Thanks in advance,

    Krystof.
     
  2. Tofek

    Tofek Member

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    Anyone ? Or can I make a separate bath with it, since it works only at low pH (I have sulfuric acid to lower the pH of water for example) ?
     
  3. Alessandro Serrao

    Alessandro Serrao Member

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    Basically if the hardener is too acidic then it could trigger sulfur colloidal precipitation out of the fixer.
    Tetenal Harter's acidity is calibrated to be used only with Tetenal acidic fixer.
     
  4. Tofek

    Tofek Member

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    But it is written on the box that you can add it to a stop bath, so basically just an acidic solution, nothing more, right ?

    Do you use another type of hardener ? I read about a formol based one.
     
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  5. Alessandro Serrao

    Alessandro Serrao Member

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    The Tetenal Harter is an alum based hardener. Alum must be in an acidic environmento to work properly.
    So basically yes, you can use it also as a stop bath.
    There are other hardeners available: formaldehyde, glutaraldehyde, chrome alum...
     
  6. Tofek

    Tofek Member

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    Ok. Do you have an idea of the concentration of sulfuric acid or vinegar if I make the stop bath of one of these two ?
     
  7. Alessandro Serrao

    Alessandro Serrao Member

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    Don't use sulfuric acid. It's just too strong.
    Just diluite the hardener following the instruction as you would if you had to use it in the fixer.
     
  8. Tofek

    Tofek Member

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    Ok, but how do you make the stop bath ? (Without buying one). Should I use acetic acid or citric acid ? I usually use plain water as stop bath when processing negatives.
     
  9. Alessandro Serrao

    Alessandro Serrao Member

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    Just use the Tetenal Harter diluited as per instruction as a stop bath.
    Or use citric acid 15g/lt.
     
  10. Tofek

    Tofek Member

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    Ok then, thank you