Quote Originally Posted by scootermm

If I remember correctly, 10drops = 1ml roughly of solution.

I like your approach of mixing minimal amounts of toner. It sounds like it produces repeatable results with a minimum of material.

However, the volume of 1 drop from a plastic dropper is usually considered to be
0.05 ml. This will vary some by the barometric pressure, ambient temperature, dropper shape, etc. so consider this to be the accepted average volume.

Don Bryant