How many drops are in one milliliter?

[Curt]

How many drops are in one milliliter for the purpose of determining how many prints can be made from a 100 ml bottle for a "normal" Pt/Pd print?

Curt

[Don Bryant]

How many drops are in one milliliter for the purpose of determining how many prints can be made from a 100 ml bottle for a "normal" Pt/Pd print?

Curt

The volume of a drop as i recall is dependent upon the specific gravity of the liquid and the geometry of the 'dropper'.

Glass eye droppers are reported to be less uniform from dropper to dropper compared to droppers made of plastic.

At any rate, if you are using a plastic dropper as sold by Bostick & Sullivan, the volume of the droplet will be approximately 0.05ml. That works out to about 20 drops per ml.

[Curt]

The volume of a drop as i recall is dependent upon the specific gravity of the liquid and the geometry of the 'dropper'.

Glass eye droppers are reported to be less uniform from dropper to dropper compared to droppers made of plastic.

At any rate, if you are using a plastic dropper as sold by Bostick & Sullivan, the volume of the droplet will be approximately 0.05ml. That works out to about 20 drops per ml.

Don that's exactly what I found to be the answer, given the variables.

[nevio presotto]

You'r wright there are to many variables. For this reason when I want to now the exact volume of a drop of the solutions to mix or spread I use a 2ml plastic graduated syringe (without it's needle) and count the drops till 1 ml.

[Chris101]

If your process requires precise sub-milliliter measurements, you might want to actually calibrate your dropper with the solution you are using.

[Don Bryant]

If your process requires precise sub-milliliter measurements, you might want to actually calibrate your dropper with the solution you are using.

That's what micro-pipettes are used for. The disposable plastic pipettes are actually accurate enough for alt processes and aren't terribly expensive. They can be reused, as well.

Don