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  1. #1
    Shaggysk8's Avatar
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    Chemical Dilution mixing

    This is a really stupid question, but I keep confusing myself.

    Ok so I have 500ml of Rodinal and if I want to mix 1:100 my final mix is say 300ml do I divide 300 / 101 = 2.97

    So I need 2.97ml Rodinal and 297ml water.

    So does that really mean that I will get out of that 500ml 168 rolls of film?
    That seems like loads.

    I just need to double check as this saturday will be my first time developing, I might do 1:50 anyway as measuring 3ml might be hard.

  2. #2

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    First lets assume that by 1:100 you mean 1+100. When you get to dilutions this weak, the easy thing to do is mix a bit more than you need to keep the numbers even. So if you need 300 ml of mix, just prepare 3+300 = 303 ml of mix and then either toss the extra or go ahead and use a bit more than is called for if it won't make any difference. A tank that will hold 300 ml will probably not know the difference.

    The second question is if 3 ml of active developer is enough to develop a roll of film. That is a more complicated question.

    Denis K
    Last edited by Denis K; 09-17-2009 at 04:50 PM. Click to view previous post history.

  3. #3
    Rick A's Avatar
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    Measuring 3ml isnt hard if you have a childs liquid med doser. They come with either a bulb on the end, or look like a syringe. They are marked with the dose amount in tsp's. or ml's. I make sure the ones I get are marked in ml. when I measure , i use 3ml + 300ml.
    Rick

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    Shaggysk8's Avatar
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    The development times is 15mins thats why I was thinking 1:50 at 11mins that is at least 6ml, but it really does not seem like much, but I guess I will find out.

  5. #5
    MattKing's Avatar
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    If you have a small graduate (e.g. the Patterson 45ml graduate) that is graduated in millilitres, put 40 millilitres of water in and then add enough of the concentrate to bring it up to 43 millilitres.

    Matt

  6. #6

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    Don't mean to muddy the waters here, but about all you can cover with 300ml is maybe one 4X5 sheet in a tupperware sandwich container.

  7. #7
    Greg Davis's Avatar
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    Quote Originally Posted by Rich Ullsmith View Post
    Don't mean to muddy the waters here, but about all you can cover with 300ml is maybe one 4X5 sheet in a tupperware sandwich container.
    A standard single roll tank for 35mm uses 250ml or 8 ounces.
    www.gregorytdavis.com

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  8. #8
    L Gebhardt's Avatar
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    I have seen people say you only need 2.5ml of rodinal per roll. Agfa recommends 10ml per roll. I have used 6ml per roll of 120 and have had good results. I haven't tried only 3ml.

    3ml + 297ml is actually 1+99, which is close enough to 1+100 to not matter. To make 3ml into a 1+100 dilution you would come out with 303ml of mixed developer.

    edit: sorry your math is right, I was referencing the post below yours.

  9. #9

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    I use 1+500 for one roll of 120 film, which, I think is equal to a 36 exp 35mm roll. If you have a 2-roll tank, you could cover yourself for sure by mixing 1+500, put your reel in the bottom, with an empty reel on top. Use enough to cover the top reel, leaving a little space at the top for chem movement. For me, this is 425ml.

  10. #10

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    The best way (and clean) to measuring Rodinal is with 3 ml, 0,10 $, 6" long plastic pipettes.
    Franol

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