Selenium Toner Shelf Life

Discussion in 'B&W: Film, Paper, Chemistry' started by Photographica, Jul 24, 2004.

  1. Photographica

    Photographica Member

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    I just found a bottle of Kodak Rapid selenium toner in a back corner of my darkroom shelves. I had forgotten it was there. From the store tag on the bottle, I know this is at least 10 years old. It's never been opened.

    Does anyone know if this selenium toner might still be good?

    Bill
     
  2. Les McLean

    Les McLean Subscriber

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    It should be perfectly OK, I've kept undiluted selenium toner for at least 5 years without problem.
     
  3. Ka

    Ka Member

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    And how long should a mixed bottle (diluted) last on the shelf? Will it discolour when exhausted?
     
  4. Julia819

    Julia819 Member

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    hmm...while we're on the topic, how long does print-flattening solution keep?
     
  5. skahde

    skahde Member

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    It keeps as long as it is clear. It usually dies when the pH goes up to far and the selenium precipitates out off solution. For better keeping you can add a small amount Kodalk or borax. It will work slower this way. I started with 10g Kodalk/L and got a *very* slow toner that kept forever. I now add just 1g/L as a small pH-plus depot and I am no longer troubled with my toner dying after 3 or 4 sessions. Another trick to make selenium work faster is to add 1ml/L of Kodak brown toner. This will not or at least not visibly alter print tone but the selenium becomes much faster working as I found out when I did some experiments with homebrew combination-toners.

    best

    Stefan
     
  6. Ka

    Ka Member

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    Cheers, Stefan... that's some useful info for me. And I actually have borax. Super.
    ka