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Thread: Brown rodinal?

  1. #11
    George Nova Scotia's Avatar
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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?

  2. #12
    Richard Sintchak (rich815)'s Avatar
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    Quote Originally Posted by seadrive View Post
    I'm pretty sure there's a pun standing around in there somewhere.

    FWIW, I've never used Rodinal (or R09, for that matter) that wasn't brown. Isn't it supposed to be brown?
    Usually a sort of medium amber at first before opening.
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    "Well, my photos are actually much better than they look..."

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  3. #13
    Richard Sintchak (rich815)'s Avatar
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    Quote Originally Posted by George Nova Scotia View Post
    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?
    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.
    -----------------------

    "Well, my photos are actually much better than they look..."

    Richard S.
    Albany, CA (San Francisco bay area)

    My Flickr River of photographs
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    My Photography Website
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  4. #14
    sly
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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.

  5. #15
    Leigh B's Avatar
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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 Leigh B; 07-28-2012 at 09:32 PM. Click to view previous post history.
    “Wise men talk because they have something to say; fools, because they have to say something.” - Plato

  6. #16
    George Nova Scotia's Avatar
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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.

  7. #17
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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.
    ---
    Uwe Pilz

  8. #18
    nicholai's Avatar
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    My R09 was yellowish at first, turned brown over a few nights.

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