Brown rodinal?

Discussion in 'B&W: Film, Paper, Chemistry' started by nicholai, Jul 28, 2012.

  1. nicholai

    nicholai Member

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    My stock rodinal turned brown. I opened it just a week ago. Why is this, and is it a bad sign?

    Nicholai
     
  2. BMbikerider

    BMbikerider Member

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    Rodinal will turn brown very quickly but this will not affect it's working properties. However I don't like using a chemical that appears to have gone off so what I do is decant the 500cc bottle into 5 x 100cc glass bottles (or the equivalent) and use one at a time. I don't know where you will get them where you, are but my local pharmacy will sell them very cheaply once you explain what they are for.

    I also use them to preserve RA4 Developer and Paper developer which I make up or buy in large quantities. This stops the chemical from deteriorating. Plastic will absorb oxygen over time and this is what 'kills' the developers. Glass is a far better alternative.
     
  3. Richard S. (rich815)

    Richard S. (rich815) Subscriber

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    I've used Rodinal that has gone inky black and was likely over 20 years old with seemingly no difference I could tell. No worries.
     
  4. nicholai

    nicholai Member

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    Haha, thats great to hear. Thanks! :D
     
  5. jm94

    jm94 Member

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    Rodinal will last decades even when turned brown. I heard from somewhere they found some in a WWII bunker that was over 50 years old and it still worked!

    Rodinal will keep well but once mixed has to be used instantly as it goes off quickly
     
  6. Leigh B

    Leigh B Member

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    As jm94 said, Rodinal concentrate lasts for decades, even in partially-used bottles.

    Discoloration, even if severe, does not affect its performance.

    Once mixed, it should be used within about 15 minutes. I always mix it while the film is in the pre-soak.

    I've been using Rodinal for over 50 years (not the same bottle) and have never experienced any variation in performance with age.

    - Leigh
     
  7. Steve Smith

    Steve Smith Subscriber

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    That's taking stand processing to extremes!


    Steve.
     
  8. Leigh B

    Leigh B Member

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    I can't stand stand processing. It's the most ridiculous concept ever developed.

    - Leigh
     
  9. nicholai

    nicholai Member

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    It has its merits, but i think thats out of the topic :wink:

    Nicholai
     
  10. seadrive

    seadrive Member

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    I'm pretty sure there's a pun standing around in there somewhere. :wink:

    FWIW, I've never used Rodinal (or R09, for that matter) that wasn't brown. Isn't it supposed to be brown?
     
  11. George Nova Scotia

    George Nova Scotia Subscriber

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    What about brown Rodinal with crystals in it? I have a bottle about a third full with an unknown history that "rattles" like there are crystals in it. Anyone ever come across this? Should I just toss (dispose of properly) it?
     
  12. Richard S. (rich815)

    Richard S. (rich815) Subscriber

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    Usually a sort of medium amber at first before opening.
     
  13. Richard S. (rich815)

    Richard S. (rich815) Subscriber

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    I've used plenty with crystals as it aged. Some people decant them. I'm just careful not to pour them out though I may have occasionally.
     
  14. sly

    sly Subscriber

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    My last bottle of Rodinal had a bunch of crystals in the bottom. I just continued to use it, until the concentrate was all gone. The quality seemed consistent.
     
  15. Leigh B

    Leigh B Member

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    You'll occasionally get crystal formation. It doesn't matter.

    The concentrate supposedly has a saturated solution of sodium hydroxide, which will precipitate crystals under some circumstances.
    In fact, for a saturated solution to exist, there must always be some crystals present, although they might be very small.

    I usually shake it to dissolve any that will do so, then go ahead and use it. It always performs as expected.

    - Leigh
     
    Last edited by a moderator: Jul 28, 2012
  16. George Nova Scotia

    George Nova Scotia Subscriber

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    Thanks guys, good to know about the crystals. I'll have to give it a try, only used Rodinal once from the full bottle. I haven't try printing the negs - they were just test rolls to see if the cameras I picked up were working. Much easier than measuring HC110 from concentrate.
     
  17. piu58

    piu58 Member

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    Rodinal contains KOH, caustic potash. With air contact this changes partially into K2CO3, potassium carbonate , which is less soluble and forms crystals.
     
  18. nicholai

    nicholai Member

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    My R09 was yellowish at first, turned brown over a few nights.