Re: Toning the Cyantoype

MessageLoris

With traditional cyanotype I have not tried clearing in citric acid.
I have tried Fabriano 5, COT-320 and Buxton with similar results.
Bleaching with sodium carbonate (or even tap water! Its pretty alkaline here)
My tannic acid concentration is 1 teaspoon per litre.
Typical toning time is around 2 mins - 5 mins.

Perhaps the tannic acid is the key.

David
  ----- Original Message -----
  From: Loris Medici
  To: alt-photo-process-l@usask.ca
  Sent: Thursday, April 20, 2006 1:53 PM
  Subject: RE: Toning the Cyantoype

  BTW, what is your toning time? I tone not more than 5 minutes..

  Regards,
  Loris.
    -----Original Message-----
    From: Loris Medici [mailto:mail@loris.medici.name]
    Sent: 20 Nisan 2006 Perşembe 15:51
    To: alt-photo-process-l@usask.ca
    Subject: RE: Toning the Cyantoype

    Maybe you're using too much tannic acid (I use one full dessert spoon per litre... or the paper is not adequate; some papers stain more than others). Do you clear your cyanotypes in citric acid after development (and wash again)? IME, if I treat cyanotypes in citric acid after the first wash (read as development) I get a much more contrasty image (cleaner, white highlights - otherwise, the highlights are low contrast and I can't get paper white) and much less staining (if any... in my case it's not noticable *unless compared side-by-side with non-treated paper*).

    Regards,
    Loris.
      -----Original Message-----
      From: David & Jan Harris [mailto:david.j.harris2@ntlworld.com]
      Sent: 20 Nisan 2006 Perşembe 15:38
      To: alt-photo-process-l@usask.ca
      Subject: Re: Toning the Cyantoype

      I find that even tannic acid stains the paper significantly, in fact there doesn't seem to be much difference in staining between tannic acid and green tea. The colour is a little different though (tannic acid is pinker which I find more pleasant).

      Dave
Received on Thu Apr 20 07:21:31 2006