PaRodinal, 5 Years Later.

Discussion in 'B&W: Film, Paper, Chemistry' started by ZorkiKat, Feb 20, 2011.

  1. ZorkiKat

    ZorkiKat Member

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    According to this page, paRodinal has a “maximum shelf life of 90 days“....I say not.

    Today, the second batch of paRodinal I brewed in 2006 turned 5 years old. Still in its original recycled HDPE bottle. Half-full, and was stored in not-so-fair conditions: indoors, but not in the dark, and in unregulated tropical temperatures which reach about 35ºC or more in the summer. The bottle has warped, perhaps due to the same reasons why ‘real’ rodinal plastic bottles warp in long-time storage: air depletion of sorts.

    [​IMG]

    The other endearing qualities of Rodinal, like compensation and increased edge sharpness, have already been observed with paRodinal. Longevity is the only quality left to be seen, and can only be appreciated after some years have passed. Five years is fairly long enough.

    To initially test this 5-year old concentrate’s potency, I subjected it to the “standard test” method I use for testing other paRodinal baths whose efficacy has become questionable: by dabbing a bit of the concentrate on a piece of unexposed film. The dabbed area, when the concentrate is good, will darken quickly, and turn black in about 2 seconds. I was pleasantly surprised to see that the old concentrate was able to darken the dabbed area as quickly as a new solution would. This indicated that the old paRodinal was still good.

    [​IMG]


    I made a 1+50 solution and developed a roll of “Fomapan 400″ , for 11 minutes at 20ºC. This is the standard time for Rodinal diluted in the same manner. No extension or compensation of any sort for any perceived weakening of the developer due to aging was made. The film was developed as if the concentrate was new.

    This are what I got:

    [​IMG]

    [​IMG]

    It is apparent that paRodinal also shares Rodinal's longevity. Only time will tell if paRodinal can still work after 40 years.
     
  2. chioque

    chioque Subscriber

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    Great stuff. Are you selling this stuff anywhere, BTW?
     
  3. ZorkiKat

    ZorkiKat Member

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    Just in Manila :smile:
     
  4. David A. Goldfarb

    David A. Goldfarb Moderator Staff Member

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    I tested a batch recently that was a couple of years old, and it worked perfectly.
     
  5. Alan Johnson

    Alan Johnson Subscriber

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    Thanks to ZorkiKat, it is also possible to make a version of PaRodinal which is clear, unlike the version on digitaltruth.com.
    http://photo.net/black-and-white-photo-film-processing-forum/00UxmB
    I just tested a sample of the clear version 15 months old with the "dab test" ,it still works OK although the bottle is now only 20% full.
    Interestingly, this initially clear version now has crystals in it but I do not know what they are.
     
  6. David A. Goldfarb

    David A. Goldfarb Moderator Staff Member

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    And that batch that was a couple of years old in Feb 2011 is still going strong!
     
  7. luizjorgemn

    luizjorgemn Member

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    Mine has 18 months and is clear and working!!!


    Sent from my iPad using Tapatalk HD
     
  8. StoneNYC

    StoneNYC Inactive

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    What is PaRodinal?? Thanks


    ~Stone

    The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

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  9. David A. Goldfarb

    David A. Goldfarb Moderator Staff Member

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    It's a film developer made from Tylenol tablets, very similar to Rodinal.
     
  10. StoneNYC

    StoneNYC Inactive

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    Oh wow!!! Cool!! Where can I find a link with instructions? Lol


    ~Stone

    The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

    Sent from my iPhone using Tapatalk
     
  11. Alan Johnson

    Alan Johnson Subscriber

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    The original formula was given by Sreenath but Donald Qualls did work on it and introduced it to the photo community. His original instructions are here:
    http://silent1.home.netcom.com/Photography/Dilutions and Times.html#Parodinal
    His version is cloudy.If you want a version that is clear the procedure summarized by Mr O'Connor on p2 of the link I posted above is as good as it gets.The performance of the cloudy and clear versions is identical. Read the safety notes on sodium hydroxide, it is caustic and dissolves people or parts thereof.
    Acetaminophen=Tylenol=Paracetamol for this purpose.
     
  12. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

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    Are results similar to Rodinal or is formula similar to Rodinal ?

    What is formula of Tylenol tablets ?

    edit : I looked to the link and tylenol is paracetamol. Can anyone give a link to rodinal formula to check the details.

    Thank you,
    Umut
     
    Last edited by a moderator: Dec 27, 2012
  13. Athiril

    Athiril Subscriber

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    After scouring the internet for you, I found where the formula is posted.
    http://www.apug.org/forums/forum37/87742-parodinal-5-years-later.html
     
  14. el wacho

    el wacho Member

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    ah how i miss australia...
     
  15. David A. Goldfarb

    David A. Goldfarb Moderator Staff Member

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    So checking in again with my same first batch of paRodinal, which I've traced to 2008 via this post:

    http://www.apug.org/forums/forum37/21181-rodinal-substitutes-11.html

    I thought I'd give it a go to process a few test rolls (Noblex just back from the shop) of Adox CHS 100 (EI 200, 1:50, 10' 15" at 75F, which is the temperature of our cold tap water), and the negs look fine. There's some kind of precipitate rattling around in the bottle, but the film doesn't seem to mind.