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  1. #1
    ZorkiKat's Avatar
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    PaRodinal, 5 Years Later.

    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.


    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.



    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:




    It is apparent that paRodinal also shares Rodinal's longevity. Only time will tell if paRodinal can still work after 40 years.
    FED ZORKI SURVIVAL SITE
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    Zorkikat.Com

    "不管黑猫白猫能抓到老鼠就是好猫。" 邓小平
    It doesn't matter if a cat is black or white, so long as it catches mice.-邓小平

  2. #2
    chioque's Avatar
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    Great stuff. Are you selling this stuff anywhere, BTW?

  3. #3
    ZorkiKat's Avatar
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    Quote Originally Posted by chioque View Post
    Great stuff. Are you selling this stuff anywhere, BTW?
    Just in Manila
    FED ZORKI SURVIVAL SITE
    RANGEFINDERFILIPINAS
    Zorkikat.Com

    "不管黑猫白猫能抓到老鼠就是好猫。" 邓小平
    It doesn't matter if a cat is black or white, so long as it catches mice.-邓小平

  4. #4
    David A. Goldfarb's Avatar
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    I tested a batch recently that was a couple of years old, and it worked perfectly.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  5. #5

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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-pho...g-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. #6
    David A. Goldfarb's Avatar
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    And that batch that was a couple of years old in Feb 2011 is still going strong!
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  7. #7

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    PaRodinal, 5 Years Later.

    Quote Originally Posted by ZorkiKat View Post
    Just in Manila
    Mine has 18 months and is clear and working!!!


    Sent from my iPad using Tapatalk HD

  8. #8
    StoneNYC's Avatar
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    PaRodinal, 5 Years Later.

    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

    Sent from my iPhone using Tapatalk
    ~Stone | "...of course, that's just my opinion. I could be wrong." ~Dennis Miller

  9. #9
    David A. Goldfarb's Avatar
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    PaRodinal, 5 Years Later.

    It's a film developer made from Tylenol tablets, very similar to Rodinal.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  10. #10
    StoneNYC's Avatar
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    PaRodinal, 5 Years Later.

    Quote Originally Posted by David A. Goldfarb View Post
    It's a film developer made from Tylenol tablets, very similar to Rodinal.
    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
    ~Stone | "...of course, that's just my opinion. I could be wrong." ~Dennis Miller

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