Spot clearing blues to white / bleaching cyanotypes

Discussion in 'Alternative Techniques & Photo Gallery' started by tgeis, Oct 19, 2015.

  1. tgeis

    tgeis TPF Noob!

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    I am trying to find a way to spot bleach out certain areas of blue, after the exposure/washing process. I have tried household bleach but it leaves the white yellowish. I am looking for a clear white. Any pointers are much appreciated! Thanks :)


     
  2. Derrel

    Derrel Mr. Rain Cloud

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    Would "Farmer's Reducer" work? Is there a modern, current substitute for that product? APUG might have some knowledgeable people, as might some type of alternative process guru.
     
  3. compur

    compur No longer a newbie, moving up!

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    From the instructions for Photographer's Formulary Cyanotype chemistry:

    "After Treatment: A spot application of a 5% solution of oxalic acid (5
    grams per 100 ml) can be used to clear the whites of blue. Wash the print
    after its use. A Prussian blue water color can be used for spotting the
    areas."
     
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