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  1. #1
    Stephen J. Collier's Avatar
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    Measuring Rodinal (Word Problem Ahead)

    Ok, this may be a very dumb question, but it has flummoxed me and many of the people I have asked.

    I am working on a solid Rodinal addiction and for the life of me I can't figure out how to measure the stuff appropriately.I am going to start using it at the 1-50 ratio and go from there.

    I have a two 35mm reel S/S tank that holds about 16oz of liquid. I believe that 16oz is roughly 460ml. So it seems that the ratio for my tank should be 9ml of Rodinal to 450ml of H2O. But there doesn't seem to be a Graduate that measures from 1ml all the way up to 500ml. So do I measure my Rodinal in a small graduate and then add it to H2O already measured in a larger graduate?

    I didn't think about it until I really tried to figure the actual measurements, but is rodinal really potent enough to be effective at 9ml to 450ml. I know it's true, but it seems nuts.

    Am I wrong here? Is there an easier way to measure this stuff?
    [COLOR=DarkOliveGreen][SIZE=2]"We are not at War, we are having a nervous breakdown". Hunter S. Thompson[/SIZE][/COLOR]

  2. #2
    clogz's Avatar
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    Hello Stephen,

    For Rodinal and other devs I use a syringe that came with a DIY inkjet refill kit.
    Your local pharmacy will have a selection.
    Digital is best taken with a grain of silver.

  3. #3

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    Measuring Rodinal

    I will send you a syringe if you PM me with your address. These hold 2oz. and are new shape-I'll send you 2 just in case. Oh yeah-no charge!
    Regards Peter

  4. #4
    Leon's Avatar
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    I'm the same as clogz - use a 5ml syringe and rubber stopper from the local parmacist (it was free).

  5. #5

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    I use either a syringe (10 ml. or 20 ml.) or a graduate. I measure the Rodinal and pour it into the beaker, then I take some water into the syringe or graduate to get all the Rodinal out and put that into the beaker too. Then I pour water into the beaker to make the desired amount of developer.

    I use Rodinal 1+25, 1+50 and 1+100. The small amount the Holy Water (Rodinal) is quite enough as it is very concentrated.

    One thing is for sure, making a "stock solution" of Rodinal (e.g. 1+5 or 1+7) for further dilution when making working solution is a very bad idea, although it would make measuring easier. Rodinal will keep for years if concentrated but will exhaust in a few days when diluted.


    Greetings Morten

  6. #6

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    9mls of rodinal will do more than two film! I think there's a manufacturer recommended minium amount but anyone who uses it 1:100 probably undercuts that, I certainly do. Most measerly amount I've experimented with was 0.75ml in 300ml of water (1:400) and after 90mins of minimal agitation, my negs appeared. I don't recommend that ratio for everyday use though.

    To use small doses, get a suitable sized sryinge (no needle) from the pharmacy. Measure it out, squirt into your 500ml (or whatever) graduate and then add the water.

  7. #7

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    Quote Originally Posted by Nige
    To use small doses, get a suitable sized sryinge (no needle)
    Why not....a shot of Hot Rod into veins is quite refreshing (and helps your body develop properly )

    Morten

  8. #8
    Stephen J. Collier's Avatar
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    Thank you all for your help!!!
    [COLOR=DarkOliveGreen][SIZE=2]"We are not at War, we are having a nervous breakdown". Hunter S. Thompson[/SIZE][/COLOR]

  9. #9
    rogueish's Avatar
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    Try measuring 18.5 ml of Ilford HC (1+31) (sorry Morten, still resisting the militia) in a 50 ml graduate for 120 film or 20.3ml for 2 spools of 35mm!
    :rolleyes:
    Yes a syringe is definitly the way to go!

  10. #10
    titrisol's Avatar
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    just a sde note.... there are larger syringes @walgreens or @vet supply stores

    I have an assortment of 2, 5, 10 ml, and I find the 5ml the most useful.
    Mama took my APX away.....

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