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  1. #11
    gainer's Avatar
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    My only reason for seeking a non-carbonate activator was the calcium in my tap water, which causes a cloudy precipitate and could in fact reduce the pH. I'm sure I had a higher concentration of NaOH than you would find in even saturated metaborate, but I lost track of my recipe. If you use softened or distilled water, why not use the carbonate?

    I can no longer get the NaOH locally, but I can get slaked lime and sodium carbonate, from which I can make NaOH.
    Gadget Gainer

  2. #12
    patrickjames's Avatar
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    Thanks for all the replies. I guess I will just try it both ways and see what happens. Anyone want to hazard a guess as to how much faster the developing times will be with the 10% NaOH? I think I am in the 12min range right now.

    Patrick

  3. #13
    mrred's Avatar
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    I know I am waking up an old thread, but the following does work.

    750ml distilled water
    75 g sodium hydroxide
    35 g borax
    water to make 1l

    I kept adding the borax until I got the grain under control and I think the grain is better than the standard alkali.
    Get it right in the camera, the first time... My flickr
    Peter Carter

  4. #14

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    is that the alkaline bath for 1:1:100 pyrocat dilution or do you dilute?

  5. #15
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    It's the one for the 1:1:100 . Gainer (in this thread) suggests a version, but only gives a ph just above 9. It is not heavy enough for catechol. I reduced the %10 lye solution Sandy suggested and wanted to find how much lower I could reduce it. At that point I fine tuned it with the borax.

    You may have to adjust your times slightly, but I found it in the ball park.
    Get it right in the camera, the first time... My flickr
    Peter Carter

  6. #16

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    link not there. but i get the idea thanks.

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