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  1. #41
    Photo Engineer's Avatar
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    Quote Originally Posted by MDR View Post
    Ron I always thought that albumen was very different to gelatine and that they were not related in any way except that both have an animal source and are proteins mixed with something.
    Chicken gelatin or albumen are similar to bone and pig gelatin but the albumen will not chill set. Fish gelatin is also similar but will not set. We have used all of these for testing purposes and have even used Yak gelatin.

    You can actually make an emulsion in albumen and coat it. It will not chill set, and its properties will be way off due to the heavy load of sulfur and the thinness of the gelatin.

    PE

  2. #42
    MDR
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    Yak sounds like fun and I just can imagine the public outcry if Kodak would have used Yak

  3. #43
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    Umm, they did, but it was years ago. Lets keep it our secret though, ok?



    PE

  4. #44

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    i have tried to soak paper in albumen and then coat it with gelatin
    didn't work ... the albumen was set / hardened after drying
    but the gelatin didn't like it, as almost repelled by it ..
    same thing with collodion ...
    both wet collodion ( ended up a mess ) and after it was dried
    into celluloid / flammable plastic, the gelatin didn't like it and stayed liquidy ...

    good to know these ( maybe not collodion ? ) will work with cyanotypes

    ....

    ron, will collodion ( dried out ) work with cyanotype chemistry ?
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  5. #45
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    Not AFAIK. Collodion is dissolved in Ether and the Cyanotype chemistry is only water soluble.

    PE

  6. #46

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    Quote Originally Posted by Photo Engineer View Post
    Not AFAIK. Collodion is dissolved in Ether and the Cyanotype chemistry is only water soluble.

    PE
    thanks ron ..

    for a second i was thinking that the collodion could be pouted onto a plate and dried
    and the cyanotype chems could be plied to it so its like a film ..
    i know other "plates" use collodion as part of their makeup
    ( collodion dry plates and all that fun silver sunbeam stuff ) ...
    so i made the leap ... the only problem of course is collodion is much
    more flammable than paper
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  7. #47
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    Try it. It just might work.

  8. #48
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    Getting close

    After struggling with the neg, I'm getting close. Click image for larger version. 

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    "Photography, like surfing, is an infinite process, a constantly evolving exploration of life."
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  9. #49

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    Not bad for starters, congrats and keep going. I see a BIG problem with your negative though; the tonal progression isn't right. (Too flat in the midtones and highlights - that's not the usual tonal progression of cyanotype, indicating your calibration is way off...) Best try with a real step tablet first (preferably with a 31-step tablet - each step log 0.1), just make sure the tonal progression and range are how we expect them, and to see if you have anything wrong in the analogue part of the process. If the analogue part is OK, then HybridPhoto is the place to discuss about the digital part.

    Hint: With the step tablet test, you should expect a density range between log 1.4 - 1.6 (or slightly more - up to log 1.8) with traditional cyanotype, and very clear / discernible tonal progression.

    Regards,
    Loris.

  10. #50
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    Thanks Loris. It's a hybrid process. I noticed it didn't match my calibrated screen. I'll post on HybridPhoto.
    "Photography, like surfing, is an infinite process, a constantly evolving exploration of life."
    Aaron Chang

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