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Thread: Rodinal with rotary processing.. add EDTA salt?

  1. #1

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    Thumbs up Rodinal with rotary processing.. add EDTA salt?

    Someone once told me that if I was to use Rodinal with a rotary process that I should add EDTA salt. Has anyone heard of this? Does it work and do you recommend it? Maybe the new formulas has this already added?
    Thanks,

    Gabriel

  2. #2
    W K Longcor
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    Re: Rodinal with rotary processing.. add EDTA salt?

    Did the "someone" tell you why the suggestion of the addition? My own experience (from a decade ago) was with Rodinal in a Colenta rotary processor. I never modified the developer in any way - and always got excellent results.

  3. #3

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    Re: Rodinal with rotary processing.. add EDTA salt?

    Hi WK,
    He added the EDTA salt to slow down the development in the rotary, because he said rodinal is not good at constant development. The reason I asked was to see if anyone had experience with this. I think I will just try the normal rodinal formula and subtract 15% for rotary process.
    Thanks,

    Gabriel

  4. #4
    W K Longcor
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    Re: Rodinal with rotary processing.. add EDTA salt?

    As I said, My experience is from some time back. I ran my own test as far as processing times and dilutions -- and I am afraid I do not remember just what I used. I no doubt have a log of such tests -- but the paperwork is filed away -- just what box -- stored where -- I don't know. I do know that I did not add anything to the basic Rodinal formula -- and I got superior results -- perhaps as you say, by shortening time, or modifying dilution.

  5. #5
    Eric Biggerstaff
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    Re: Rodinal with rotary processing.. add EDTA salt?

    My primary developer is Rodinal diluted 1 to 50 in a Jobo 3010 drum. I never add anything and the results are terrific.
    Eric Biggerstaff

    www.ericbiggerstaff.com

  6. #6

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    Re: Rodinal with rotary processing.. add EDTA salt?

    Agree with Eric!

  7. #7

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    Re: Rodinal with rotary processing.. add EDTA salt?

    Ditto on the ditto.

    Rodinal 1+50 in a 3010. I use a full liter of chemistry and the negs are perfectamundo. After about 5 years of struggling with all kinds of frustrating, infrequent odd issues with Pyrocat I am a happy camper.

    I like a hefty neg so I don't cut the time at all.

  8. #8

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    Re: Rodinal with rotary processing.. add EDTA salt?

    Make sure you use 10 ml of Rodinal concentrate for each 8x10 sheet of film or equivalent (one 35mm roll, one 120 roll, four 4x5 sheets, etc).

    If this results in too much liquid volume for your rotary drum, you must either reduce the amount of water, thereby changing the concentration, or reduce the number of films being processed simultaneously.

    Rodinal has been my developer of choice for over 50 years. Before I got the Jobo I used regular stainless steel tanks and manual agitation.
    I've processed hundreds of rolls of Agfapan in Rodinal using a Jobo CPE-2 with consistently excellent results.

    I don't know what EDTA is, so obviously I've never used it.

    - Leigh

  9. #9

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    Re: Rodinal with rotary processing.. add EDTA salt?

    Rodinal 1to50 is also my soup of choice , i never add salt my doctor tells me it is bad for me Cheers Gary

  10. #10

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    Re: Rodinal with rotary processing.. add EDTA salt?

    It's actually supposed to be 1 + 50, yielding a total volume of 51, although the difference is rather insignificant at these dilutions.

    - Leigh

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