How Many Drops Are In One Milliliter?

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You are using an out of date browser. It may not display this or other websites correctly.You should upgrade or use an alternative browser. How many drops are in one milliliter?

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• Thread starter Curt
• Start date Feb 26, 2010

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Curt

Member Allowing Ads Joined Sep 22, 2005 Messages 4,618 Location Pacific Nort Format Multi Format 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 ​

Barry S

Member Allowing Ads Joined Jan 28, 2007 Messages 1,350 Location DC Metro Format Large Format 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.

nickandre

Member Allowing Ads Joined Oct 22, 2007 Messages 1,918 Location Seattle WA Format Medium Format doesn't it depend upon the viscosity of the solution? --Nicholas Andre

grahamp

Subscriber Allowing Ads Joined Mar 2, 2004 Messages 1,767 Location Vallejo (SF Bay Area) Format Multi Format Measure it. I feel, therefore I photograph. Main website Mamiya TLR System Summary 3D designs on Thingiverse

MattKing

Moderator

Moderator Allowing Ads Joined Apr 24, 2005 Messages 55,047 Location Delta, BC Canada Format Medium Format 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 Matt Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time! Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2

mike c

Subscriber Allowing Ads Joined Jan 5, 2009 Messages 2,863 Location Los Angeles Format Multi Format Its one dollar a drop Curt! If its Platinum. OP OP

Curt

Member Allowing Ads Joined Sep 22, 2005 Messages 4,618 Location Pacific Nort Format Multi Format 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 ​

Vaughn

Subscriber Allowing Ads Joined Dec 13, 2006 Messages 10,275 Location Humboldt Co. Format Large Format With the droppers I use, 15 drops per ml for pt and pd salts. "Landscapes exist in the material world yet soar in the realms of the spirit..." Tsung Ping, 5th Century China

Kirk Keyes

Member Allowing Ads Joined Jun 17, 2004 Messages 3,234 Location Portland, OR Format 4x5 Format

tiberiustibz said: doesn't it depend upon the viscosity of the solution? Click to expand...

And also the dimensions of the dropper tip. Kirk For up from the ashes, up from the ashes, grow the roses of success!

Photo Engineer

Subscriber Allowing Ads Joined Apr 19, 2005 Messages 29,018 Location Rochester, NY Format Multi Format 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

Don12x20

Member Allowing Ads Joined Jan 18, 2006 Messages 249 Location Pacific North Format Multi Format Curt Make sure you are using the plastic (molded and accurate). Don't use glass- too variable. And when you get to do larger prints (>5x7) consider using the right pipettes with pipette pumps. Much faster and more accurate than drop counts. Heck, I'd be at it all day if I were to count out drops for 12x20 and 7x17. Even 8x10 and 11x14 is faster with pipettes. Don

stwb

Member Allowing Ads Joined Oct 19, 2008 Messages 42 Location Saskatoon, S Format 35mm Well if I can think back to pharmacy school which is about 10 years ago now. 1 minum is equal to .0592ml of water. But indeed, viscosity and density would certainly change the size of the drop. http://www.flickr.com/photos/garyberg/

mike c

Subscriber Allowing Ads Joined Jan 5, 2009 Messages 2,863 Location Los Angeles Format Multi Format Curt left my notes at Pers house.In Diick Arentz Book he stats that it is sold at 1% and 5%.Gold chloride Last edited by a moderator: Feb 26, 2010

photomc

Member Joined Jul 20, 2003 Messages 3,575 Location Texas Format Multi Format In addition to the liquid that is measured, the drop count 'could' change based on if the dropper is held vertical or at an angle...depends on the total volume. Best way to find out is to measure and then always try for the same conditions each time. Or depending on what you are doing, it may make no difference at all. I do not worry about it when I measure for pt/pd prints, but do try to always do it the same way. ymmv... Mike C Rambles You must log in or register to reply here. Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Share Link

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