Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,957   Posts: 1,586,095   Online: 1067
      
Results 1 to 3 of 3
  1. #1
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,561
    Images
    65

    Electron transport developer

    Some weeks ago, I started a thread on ET developers, and it didn't attract much interest, but I did get some e-mail asking for more information.

    This post is intended as a continuation and update for those interested.

    Imagine a mix of 2 developing agents. One is very active but used in low concentration. Its oxidation products do not decompose. Imagine another which is much less active, but reacts with the oxidation products of the first developer, and which itself has oxidation products which decompose into less active material.

    An example of the latter is hydroquinone, which when oxidized forms hydroquionone monosulfonate in developer solutions. The activity ratio of HQMS to HQ is about 20:1 or larger.

    So, lets assume a mix of 0.1 gram of a highly active developer and 20 g/l of a poorly active developer. But, the pair interact to regenerate the active developer.

    Now, what is the result? The result is an active developer that keeps regenerating itself. What is the result for the user? Well, this type of developer has high capacity or long tray life or both. It will yield the same results for a long time allowing process uniformity when you want to print a lot of exactly the same print. It also means that when the developer begins to die off, you can recreate the original result more easily just by increasing development time.

    In fact, it is possible to exceed current developers capacity or tray life by as much as 2x to 4x or more by appropriate formulation. This method of mixing developers with 2 activities was used in Kodak PR10 print material. It is possible. I'm just surprised that this has never been brought to fruition yet in the commercial arena.

    So, this is just FYI. Stay tuned.

    PE

  2. #2
    fotch's Avatar
    Join Date
    Mar 2005
    Location
    SE WI- USA
    Shooter
    Multi Format
    Posts
    4,230
    Very interesting. Is this patented?
    Items for sale or trade at www.Camera35.com

  3. #3
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    23,561
    Images
    65
    The Kodak method is for instant imaging.

    Otherwise, no.

    PE



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin