Coating your own Azo?

Discussion in 'Alternative Processes' started by Jorge, Apr 14, 2005.

  1. Jorge

    Jorge Inactive

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    I had an interesting call tonight. A friend of mine who is a professional photographer in Mexico City like to dabble in alt printing. So he had some baryta paper that he had mistakenly exposed to room light and rather than throw the paper away he decided fix it and then coat it with solutions for salt prints and according to him they came out beautiful. For those who have not done salt prints, a paper is seeded with a solution of ammonium or sodium chloride and then it is coated with a solution of silver nitrate to form silver chloride. This is essentially azo paper.... :smile:

    SO those of you who love Azo and are always worrying Kodak might discontinue it, dont dispair you might still have a way to print in your favorite manner.. :smile:
     
  2. Alex Hawley

    Alex Hawley Member

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    Sounds highly interesting Jorge. Two questions:
    1) Where can the paper be obtained?
    2) How can contrast grade be controlled?
     
  3. Jorge

    Jorge Inactive

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    The paper is fixed out regular enlarger paper, the contrast can be controlled by adding an oxidizer to the solution like potassium dichromate. But some testing would have to be required as I have never done it, dont want to sound like an expert on this.

    BTW, I imagine any of the silver processes like Kallitype or Argyrotype would work on fixed out paper, much like Craig's method for printing pt/pd in baryta paper. I made one pd print on enlarger paper and it came out pretty good, but then I thought why make a pt/pd or pd print that is going to look like a regular enlargement? one thing though is that the 3D look was very good.....the print has some incredible depth.
     
  4. Digidurst

    Digidurst Subscriber

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    Interesting... You know I'm going to HAVE to experiment. Just a quick clarification - your friend fixed the paper, excluding all the previous steps (developer, stop) for how long?
     
  5. Jorge

    Jorge Inactive

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    Since you are trying to remove all the silver I imagine fixing for a little longer than normally recommended would be better. If you are using rapid fixer, I would say fix for 3 mins instead of 1.

    He did say that the paper has to be washed throughly before recoating or you would get brown spots.

    Let us know how you get along.....and post some prints.
     
  6. Donald Miller

    Donald Miller Member

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    I did receive a copy of Craigs earlier booklet on his procedure. (It is around somewhere packed up at the moment.) To the best of my memory he did use tween in his pt-pd work because the problem was even absorbtion of the coating into the gelatin layer. There was some consideration of temperatures as well. I seem to recall a hotplate being used. I don't know how or if this would be required in the coating process that this thread addresses.

    Perhaps Craig could elaborate on his process if he comes across this thread.
     
  7. Jorge

    Jorge Inactive

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    My friend did not do any of that, I too have the booklet and I know what you are talking about. Craig makes two coatings, one with a warmed up support and one with a cold one.

    Interestingly enough, a while back there was a discussion of tonning Kallitypes with pd for permanence and how the pd replaces the silver in the print. So I thought why not just coat the fiber paper without fixing it first. It worked pretty good, there was some loss of speed but I did not have to make all the different coatings as explained by Craig. The problem was that I could not get rid of that yellowish tint the fiber paper has before it is fixed. The again I only did one print and did not really make an effort to make this a workable method.
     
  8. Donald Miller

    Donald Miller Member

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    Jorge,

    That was the deal with the temperature...thanks for reminding me. I think that there is certainly some potential to explore here. Need to get my darkroom reestablished so that I can get back to it.
     
  9. Digidurst

    Digidurst Subscriber

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    Will do! Thanks :smile:
     
  10. jnanian

    jnanian Advertiser Advertiser

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    jorge -

    wouldn't rapid (modern) fix bleach the print?
    i know when fixing salt prints it is recommended that a hypo solution is used ...
    just wonderin'

    -john
     
  11. Jorge

    Jorge Inactive

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    Uh...you fix before you make the print...... shot of expresso on its way to you John.. :smile:
     
  12. jnanian

    jnanian Advertiser Advertiser

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    thanks dude, i needed that! :smile: