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  1. #81
    holmburgers's Avatar
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    Hey guys!

    I apologize for being so scarce around APUG these days. I've just been busy as hell it seems like, and adjusting to a new city. My goal is to get in a routine of posting a couple times a week with what we're working on, and learning.

    Like Ron said, I've got a bromo-iodide emulsion in my refrigerator and we're going to coat it next week. We're gonna do glass plates, film and paper, and see how it fares. As Eastman said, "Pray for the emulsion!" This is a good plate formula, but Ron wants to see if it's suitable for paper, so we'll do some tests on that. Being able to pick Ron's brain in person is a treat; we've been having fun and I know we're both excited to focus more on emulsion making.

    Mostly however I've been helping with Mark Osterman and Nick B., fellow intern and Mark's apprentice. We've already had two workshops in the first 3 weeks since I've been here; 35mm daguerreotype and carbon printing. Daguerreotype (Bequerel at least) is really quite simple (and safe), and I want to give it a go myself. Carbon printing is the bee's knees, and the practical experience coming down from Mark has been great; so many little things that you have to learn by doing.

    Today and yesterday though, we're cleaning out the darkrooms in preparation for setting up a bonified emulsion lab. Some seriously amazing stuff is lurking in the cupboards here!

    The attached picture is a hand truck we filled with old paper/film. Some might be usable, a lot of it is great paper for fixing out, but in whole it represents a bunch of silver! Thinking about filling a kiddy pool with fixer and reclaiming the Ag to finance some of this..



    More later, cheers!
    Attached Thumbnails Attached Thumbnails GEH Photo Paper.JPG  
    If you are the big tree, we are the small axe

  2. #82
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    Yes! Fix it out and use it for carbon printing!
    K.S. Klain

  3. #83
    Diapositivo's Avatar
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    Great.
    May this torch run even further. Thanks to all of you for giving this fire alive.

    And to holmburgers I would just suggest he writes this statement by Leonardo da Vinci in his room:

    Tristo è quel discepolo che non sopravanza lo suo Maestro.
    A poor disciple is he who doesn't overcome his Master.

    Ad maiora!

    Fabrizio
    Fabrizio Ruggeri fine art photography site: http://fabrizio-ruggeri.artistwebsites.com
    Stock images at Imagebroker: http://www.imagebroker.com/#/search/ib_fbr

  4. #84
    Photo Engineer's Avatar
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    I'll be right over Chris. I see some paper I need!

    PE

  5. #85
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    Chris I will be in Rochester to visit you folks in Jan , I am glad you are finding your way there.

  6. #86
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    [QUOTE=holmburgers;1411173]

    Today and yesterday though, we're cleaning out the darkrooms in preparation for setting up a bonified emulsion lab. Some seriously amazing stuff is lurking in the cupboards here!
    QUOTE]


    And some seriously cool news about the emulsion lab! I've been developing a new set of recipes that I'd love to see peer reviewed. When you're up and running would you consider a part time job as a test lab? I'll supply the silver nitrate .

    Congrats on a great move, Chris.
    d
    www.thelightfarm.com
    Dedicated to Handmade Silver Gelatin Paper, Film, and Dry Plates.

  7. #87
    holmburgers's Avatar
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    Emulsions 101

    Hey everybody!

    Here's an example of Mark Osterman's ability to draw, and illustrate ideas in really simple, elegant ways. This is a flow chart showing the most basic steps of emulsion making; in this case a washed emulsion.

    The other day Ron joined us at GEH and he too made his way to the chalkboard and we had an excellent classroom session. We hope to do this once a week, or at least a few times a month, in addition to lab work, coating, processing, etc.

    There is one term in this drawing that is perhaps not entirely technically correct; or rather, is not in line with the nomenclature that I've learned from Ron's book; Digestion.

    Digestion implies the presence of silver-halide solvents (ammonia) and/or chemical sensitizers (sulfur, gold). [Ron, please correct me if I'm wrong here...]

    In the simplest form of an emulsion, the prolonged heating step after precipitation of silver-halide is called ripening. This is the process of redistributing and resolubilizing the AgX grains, which on the average, results in larger grains and in turn, more speed.

    If you imagine the state of grains after precipitation, we have a distribution of different sizes; some large and some small. The smaller the grain, the more surface area it has by weight. Thus, these smaller grains will become soluble in the presence of heat to a greater extent than the larger grains, and they will redeposit (on average) on the larger grains. The result is 2 fold; more speed from the formation of larger grains and more contrast, as the distribution of grain sizes becomes narrower (less latitude in effect). The pitfalls of course are fog and the destruction of the gelatin's setting point if too much heat is applied.

    "Nearly all the mechanisms in silver-halide emulsion making are surface phenomenon"; Ron's million dollar quote.
    Attached Thumbnails Attached Thumbnails Osterman Emulsion Flow Chart.jpg  
    If you are the big tree, we are the small axe

  8. #88
    Photo Engineer's Avatar
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    And there you have a synopsis of things so far.

    Chris left out the fact that he also has one emulsion under his belt (and in Mark's refrigerator) for coating and testing in the near future. It is an AgBrI washed emulsion which is good for plates and lantern slides, and which we hope to adapt for making prints.

    We spent about 2 hours going over the lab setup and in the classroom and hope to do it again based on Mark's schedule for our joint work at GEH.

    PE

  9. #89

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    So guys, you soon recreating Ilfochrome? j/k

    (semi-) joking aside, it's really inspiring to read about your work and studying process, even if I understand only a fraction of all that is written.

    Keep up the good work!

  10. #90
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    Thanks. We hope to.

    It would be possible to re-create a sort of Ilfochrome. I coated a variation of it back in 1975 or thereabouts. I have 2 of the hard-to-get ingredients here now, but have not been able to get the third. The fourth is really hard to get but I might manage that too.

    Chris is humming right along.

    PE

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