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  1. #1
    Curt's Avatar
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    How many drops are in one milliliter?

    How many drops are in one milliliter?

    It could be a poll as the answer is variable, what's your answer?
    Everytime I find a film or paper that I like, they discontinue it. - Paul Strand - Aperture monograph on Strand

  2. #2
    Barry S's Avatar
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    I think the rule of thumb is 20 drops ~ 1ml, but a drop is not a standard unit of measure. I measured a few of my droppers and they varied between 18-23 drops/ml.

  3. #3
    tiberiustibz's Avatar
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    doesn't it depend upon the viscosity of the solution?
    --Nicholas Andre

  4. #4

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    Measure it.
    I feel, therefore I photograph.

  5. #5
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    I have a small plastic bottle (about 60 ml) designed for dispensing liquids drop-by-drop. I use it for Kodak Photoflo 200. Based on quick tests, I find 60 drops equals 5 ml (12 drops equal 1 ml).

    I'm sure it varies by liquid, and by dispenser.

    Matt

  6. #6

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    Its one dollar a drop Curt! If its Platinum.

  7. #7
    Curt's Avatar
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    Mike do you remember what % the Gold solution was that we used, 1%, 5%, 10%? Mike, it could work out to be more or less $10.00 per 8x10, probably more with the addition of the paper and Gold. 4x5s or 5x7s are looking good. I happen to like the size of the 5x7 I made, it's large enough to be seen and yet has the Jewell like quality. I see CT prints in a larger size like Jim does.

    I looked up the drop question to see if there was any specific scientific number and what I found was 20 as Barry said. It depends on viscosity, temperature, time of day, date of full moon and others but 20 is the number. Now to find the dropper that was used to determine that number.

    Part Two:

    How many drops in a minum?

    In pharmaceutical applications, 1 drop = 1 minum.
    Everytime I find a film or paper that I like, they discontinue it. - Paul Strand - Aperture monograph on Strand

  8. #8
    Vaughn's Avatar
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    With the droppers I use, 15 drops per ml for pt and pd salts.
    At least with LF landscape, a bad day of photography can still be a good day of exercise.

  9. #9

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    Quote Originally Posted by tiberiustibz View Post
    doesn't it depend upon the viscosity of the solution?
    And also the dimensions of the dropper tip.
    Kirk

    For up from the ashes, up from the ashes, grow the roses of success!

  10. #10
    Photo Engineer's Avatar
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    You must calibrate the dropper for each solution you use. Droppers vary in tip size over a wide range, and the viscosity and density of the solution change the drop size. A heavier solution will drop off a given tip more readily than a light one for example, or a thick solution will drop off more slowly.

    PE

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