Black Light Bulbs

Discussion in 'Alternative Processes' started by ced, Dec 17, 2013.

  1. ced

    ced Member

    Messages:
    126
    Joined:
    Oct 10, 2011
    Shooter:
    Multi Format
    Excuse if already posted. Would these bulbs be good for Gum Printing as they are for Cyanotypes please?
    (http://www.velleman.eu/products/view/?id=381476)
    They are already installed at home and make excellent Cyano's but I want to make Gum's too.
     
  2. Uncle Goose

    Uncle Goose Member

    Messages:
    419
    Joined:
    Feb 7, 2006
    Location:
    Gent (Belgiu
    Shooter:
    Medium Format
    If they do Cyano's then they will do gum's too.
     
  3. ced

    ced Member

    Messages:
    126
    Joined:
    Oct 10, 2011
    Shooter:
    Multi Format
    U.G. Thanks for responding and what do you think the difference in exposure time if you have experience with this method?
     
  4. Loris Medici

    Loris Medici Member

    Messages:
    653
    Joined:
    Sep 13, 2005
    Location:
    Istanbul, Tu
    Shooter:
    Multi Format
    Ced, that highly depends on the pigment / dichromate / gum content and coating thickness of your emulsion. For my usual working procedures, gum was around 2 stops faster than trad. cyanotype. But this is absolutely non applicable to your working conditions / style. You'll have to test it for yourself.

    Regards,
    Loris.
     
  5. ced

    ced Member

    Messages:
    126
    Joined:
    Oct 10, 2011
    Shooter:
    Multi Format
    L.M. Thanks for this info it might just be a pointer!