Excellent video, Christopher. I remember you mentioned about surface tension and meniscus in your PMK video. Some people could miss that very important point. For a very small amount of liquid, say a fraction of 1 ml, one could also use those 0.01 to 0.1 ml graduated Insulin syringe. A better alternative would be using a graduated pippet. Cheers :)
Well done. Do you use different graduates for different chemicals? For example, one graduate always used for a specific developer and another one for fixers? I always use different ones because I worry about the possibility of contamination even if thoroughly cleaning the graduates. Am I being too anal?
Fixer seems to mess up plastic graduates, even if I clean them well, so I use one set of graduates for fixer, and another set for everything else (cleaning them before going from one chemical to another, of course).
Ok, maybe I'll lighten up a little bit then. LOL! I watched your pyro video last night. Very cool! Did you post the images from those two rolls of film to the internet anywhere?
I probably did. Honestly, I cannot remember what was on those rolls now! If you want to see my photos, My portfolio website is chriscrawfordphoto.com The site has photos shot with a number of different black and white films developed in different chemicals, as well as color film and color digital photos.
Another trap is using the wrong unit scale as well. Many graduates for photographic use have 2 or 3 systems of units. ml, US ounces and English ounces. It's easy for young players to accidentally use the wrong scale if not playing close attention.
the air trapped in syringes make me question the accuracy of using them. If I wanted 3 ml, I'd probably fill syringe with more, then dispense until there is 3mil less in the syringe. then dump the rest back into the stock supply. (always a risk of contaminating the stock by returning. but PMK is a toxic chemical. something to be cautious with, yet not want to discover bad developer by getting 'blank' negatives after so much work.
When you fill a syringe, you draw in a little more than needed, then turn it so the dispensing end points up. This makes the air in it rise to the end, then you push out the excess air and chemical. To me it is just easier to use a graduated cylinder made for measuring small quantities.
@@chrisandsneaky2453 The problem with this is that a syringe isn't tapered, so a 'half' pocket of air remains inside the syringe when trying to remove all air inside. Unless dispelling air while the syringe is 100% straight upside-down ... but that would squirt out dangerous acid (in my case pyrogallol acid). Yesterday, I only needed 3 ML of part A of PMK formula for a development session. I agree that a graduate may be a better choice.
Great info.!
thanks for the interesting info, and welcome back 👍
Excellent video, Christopher. I remember you mentioned about surface tension and meniscus in your PMK video. Some people could miss that very important point.
For a very small amount of liquid, say a fraction of 1 ml, one could also use those 0.01 to 0.1 ml graduated Insulin syringe. A better alternative would be using a graduated pippet. Cheers :)
I like my syringes and blunt needles for small measurements, accurate, cheap and very easy to use.
Well done. Do you use different graduates for different chemicals? For example, one graduate always used for a specific developer and another one for fixers? I always use different ones because I worry about the possibility of contamination even if thoroughly cleaning the graduates. Am I being too anal?
Fixer seems to mess up plastic graduates, even if I clean them well, so I use one set of graduates for fixer, and another set for everything else (cleaning them before going from one chemical to another, of course).
Ok, maybe I'll lighten up a little bit then. LOL! I watched your pyro video last night. Very cool! Did you post the images from those two rolls of film to the internet anywhere?
I probably did. Honestly, I cannot remember what was on those rolls now! If you want to see my photos,
My portfolio website is chriscrawfordphoto.com
The site has photos shot with a number of different black and white films developed in different chemicals, as well as color film and color digital photos.
Another trap is using the wrong unit scale as well. Many graduates for photographic use have 2 or 3 systems of units. ml, US ounces and English ounces. It's easy for young players to accidentally use the wrong scale if not playing close attention.
the air trapped in syringes make me question the accuracy of using them.
If I wanted 3 ml, I'd probably fill syringe with more, then dispense until there is 3mil less in the syringe.
then dump the rest back into the stock supply. (always a risk of contaminating the stock by returning. but PMK is a toxic chemical. something to be cautious with, yet not want to discover bad developer by getting 'blank' negatives after so much work.
When you fill a syringe, you draw in a little more than needed, then turn it so the dispensing end points up. This makes the air in it rise to the end, then you push out the excess air and chemical.
To me it is just easier to use a graduated cylinder made for measuring small quantities.
@@chrisandsneaky2453 The problem with this is that a syringe isn't tapered, so a 'half' pocket of air remains inside the syringe when trying to remove all air inside.
Unless dispelling air while the syringe is 100% straight upside-down ... but that would squirt out dangerous acid (in my case pyrogallol acid). Yesterday, I only needed 3 ML of part A of PMK formula for a development session.
I agree that a graduate may be a better choice.