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Thread: Alt-Process Prints from Digital Negatives or Positives

  1. #561

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    Re: Alt-Process Prints from Digital Negatives or Positives

    If you decide to try it, just try your normal carbon tissue formula, but add 2% - 5% of ferric oxalate to thd pigmented gelatin before you coat. First mix it in water to dissolve, which from memory can be a bit difficult with ferric oxalate. I have not experimented with FO so I have no idea how it will work.

    Coat your tissue on a clear polyester sheet (fixed out film, lith tape, etc.) and dry in the dark.

    When the tissue is dry, expose through the base. Do not expose directly on the tissue and transfer, this will not work with ferric carbon.

    Develop for 2-5 minutes in a 1/2% to 1% solution of hydrogen peroxide, wash for a minute or two, then place in the warm water bath as you normally do with carbon to wash off the soluble gelatin.

    It should be possible to transfer the carbon relief on the polyester base to a final paper support, but I have not gotten to that point yet.

    I will be interested to hear of your results.

    Sandy
    http://www.sandykingphotography.com/
    For discussion and information about carbon transfer please visit the carbon group at Yahoo.
    [url]https://groups.io/g/carbon

  2. #562
    おせわに なります! Andrew O'Neill's Avatar
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    Re: Alt-Process Prints from Digital Negatives or Positives

    Very interesting... thank you for your directions, Sandy. I'll have to find some acetate...
    What is the role of hydrogen peroxide?

  3. #563
    おせわに なります! Andrew O'Neill's Avatar
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    Re: Alt-Process Prints from Digital Negatives or Positives

    I also have some ferric ammonia citrate... maybe I should give that a try. Ferric Oxalate is a PITA to get into solution.

  4. #564

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    Re: Alt-Process Prints from Digital Negatives or Positives

    Quote Originally Posted by Andrew O'Neill View Post
    I also have some ferric ammonia citrate... maybe I should give that a try. Ferric Oxalate is a PITA to get into solution.
    I have used ferric ammonium citrate and ferric ammonium oxalate. Both worked well and go into solution easily. The formula I am now using is a slower than dichromate and diazo senstized carbon, but it may be possible to modify the ingredients to get faster cross-linking.

    Sandy
    http://www.sandykingphotography.com/
    For discussion and information about carbon transfer please visit the carbon group at Yahoo.
    [url]https://groups.io/g/carbon

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