Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,921   Posts: 1,522,096   Online: 729
      
Results 1 to 5 of 5
  1. #1
    Snapper's Avatar
    Join Date
    Mar 2004
    Location
    Brighton, England
    Shooter
    Med. Format RF
    Posts
    224
    Images
    15

    Viradon lifespan

    Can anyone tell me the shelf life of Viradon toner once mixed up?

  2. #2
    titrisol's Avatar
    Join Date
    Aug 2004
    Location
    Rotterdam
    Shooter
    Multi Format
    Posts
    1,671
    Images
    8
    I have used it for up to 4 weeks (storing in bottles between sessions).
    The more used it gets, the fastest it is and the lightest brown it gives.
    Mama took my APX away.....

  3. #3
    Ole
    Ole is offline
    Ole's Avatar
    Join Date
    Sep 2002
    Location
    Bergen, Norway
    Shooter
    Large Format
    Posts
    9,280
    Blog Entries
    1
    Images
    31
    At least two years - will let you know when I have to mix new
    -- Ole Tjugen, Luddite Elitist
    Norway

  4. #4

    Join Date
    Nov 2002
    Location
    Melbourne, Australia
    Shooter
    Medium Format
    Posts
    971
    I recently used some for only a few sheets and put it in a bottle. It was stored in darkness. When I came to use it maybe a month later, it had a scum which I think was probably elemental sulphur. The Viradon might have been contaminated with a very little sodium sulphite, since I put one print back in the toner after rinsing in it and deciding to give it a little more toning. Would that have caused the breakdown?

  5. #5
    Ole
    Ole is offline
    Ole's Avatar
    Join Date
    Sep 2002
    Location
    Bergen, Norway
    Shooter
    Large Format
    Posts
    9,280
    Blog Entries
    1
    Images
    31
    Quote Originally Posted by john_s
    The Viradon might have been contaminated with a very little sodium sulphite, since I put one print back in the toner after rinsing in it and deciding to give it a little more toning. Would that have caused the breakdown?
    Could well be. Viradon is sodium polysulfide, which will react with sulfite to gice thiosulfate and sulfur. It will decompose all by itself as well to give sulfur, or with oxygen to give sulfite and sulfur - and thus thiosulfate and more sulfur, which reacts with oxygen to give sulfate and even more sulfur...

    It basically reacts with anything, and gives sulfur as a result. But it lasts for a very long time if you can keep "anything" out of it.
    -- Ole Tjugen, Luddite Elitist
    Norway



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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