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.
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
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.