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Thread: new cyanotype process development

  1. #11
    500+ Posts earlj's Avatar
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    Ned - sulfamic acid is available in the floor tile section at Home Depot in 1 lb containers for about $6.50. It is used as a grout cleaner. I bought a 5 lb plastic bag of it on ebay for $29.99.
    Last edited by earlj; 02-12-2014 at 06:30 PM.
    because:
    "a squid eating dough in a polyethylene bag is fast and bulbous, got me?"
    -Don Van Vliet

  2. #12
    Quote Originally Posted by earlj View Post
    I acidified it with 10% sulfamic acid and tried again.

    Attachment 1689
    Nice pinhole & print!
    Did you soak the paper in the sulfamic acid or did you coat the paper with the sulfamic acid?
    I'm a beginner in cyanotype & find the soaking hard to do for bigger paper sizes, so a coating would be easier!

    regards,

    Adam

  3. #13
    500+ Posts earlj's Avatar
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    Quote Originally Posted by adam919 View Post
    Nice pinhole & print!
    Did you soak the paper in the sulfamic acid or did you coat the paper with the sulfamic acid?
    I'm a beginner in cyanotype & find the soaking hard to do for bigger paper sizes, so a coating would be easier!

    regards,

    Adam
    Adam:

    Thank you for your kind comments. I think that the paper must be soaked in sulfamic acid in order to render it buffer-free. My 11x15 sheets soak in 2 liters in a tray that is ostensibly 11x14, but the prints fit. It takes 20-25 minutes of total immersion before the bubbles stop. I doubt that you could achieve this with brushing.

    Note, though, that I am working with Mike Ware's new cyanotype formula, which is very sensitive to paper chemistry. Traditional cyanotype (Sir John Herschel's recipe) is not as emotional about the paper that it finds itself interacting with.

    Cyanotype also works well with cotton and linen as well as paper.

    Good luck, and don't hesitate to pm me with any questions that you might have.

    Earl
    because:
    "a squid eating dough in a polyethylene bag is fast and bulbous, got me?"
    -Don Van Vliet

  4. #14
    Thanks for the reply earl!

    At the moment i'm working with the traditional recipe, and have made some ok prints, but still searching to get some more out of the total process, getting some control over it. I'ts my first wet process experience!

    regards,

    Adam

  5. #15
    500+ Posts Ned.Lewis's Avatar
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    I went to a local hardware store and found some "dry acid" cleaner that contained sulfamic acid, but the container did not list whether it also contained other ingredients so I held off... will try home depot eventually. Still have a supply of paper acidified in vinegar... I soaked my paper in vinegar 1:2 with distilled water for 2 hours followed by a 1 hour wash. But I'm working with a different process so don't follow me!
    Last edited by Ned.Lewis; 03-14-2014 at 01:26 AM.
    Some photos: Ipernity
    ( pinholes and solargraphs mixed in among the rest)

  6. #16
    500+ Posts earlj's Avatar
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    This brand seems easy to find around here:
    http://www.essentialhardware.com/pro...Fa9cMgodDHoAQg
    because:
    "a squid eating dough in a polyethylene bag is fast and bulbous, got me?"
    -Don Van Vliet

  7. #17
    500+ Posts Ned.Lewis's Avatar
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    Thanks Earl, now I know what I'm looking for. The one I saw was in a green box and I couldn't tell if it was only sulfamic.
    We just arrived on Maui so will look when we get home
    Some photos: Ipernity
    ( pinholes and solargraphs mixed in among the rest)

  8. #18
    500+ Posts earlj's Avatar
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    Quote Originally Posted by Ned.Lewis View Post
    Thanks Earl, now I know what I'm looking for. The one I saw was in a green box and I couldn't tell if it was only sulfamic.
    We just arrived on Maui so will look when we get home
    Did you bring a pinhole camera?
    because:
    "a squid eating dough in a polyethylene bag is fast and bulbous, got me?"
    -Don Van Vliet

  9. #19
    500+ Posts Ned.Lewis's Avatar
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    I'm sorry to report I didn't bring one. I thought about it and thought about it and finally decided not to try to take them through airport security. Mine all use paper negatives or instant film... they look "suspicious" and I don't know about instant film and airport scanners. Of course I've seen all sorts of wonderful pinhole shots already and this is only our first full day here! My wife and daughter are putting up with hearing me say "I wish I'd brought a pinhole camera, look at that tree!!! ".

    This has made me realize that I need to build some regular film pinhole cameras!
    Some photos: Ipernity
    ( pinholes and solargraphs mixed in among the rest)

  10. #20
    500+ Posts Ned.Lewis's Avatar
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    Home now and did bring back some Hawaiian alaea salt to try salt printing with
    Some photos: Ipernity
    ( pinholes and solargraphs mixed in among the rest)

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