One quart is a hair under a liter, about .946 L equals a quart. Being that they are almost the same volume, I treat them as the same. Another way to look at it, as I was shooting for 40 ppm, is that with 2 hours at 5 mA, a quart would end up at 42.3 ppm. Which at this time doesn't matter to me.
The other issue is, how much does the 1-quart mason jar really hold? As I'll be cleaning the film out of it today I'll also measure the volume of the jar. I should be more accurate in making colloidal silver. I was in the past when I started out making smaller batches (300 ml).
For the sodium carbonate, it has been posted here that between 10 and 20 drops (.5ml - 1 ml) of 1 mole solution is good to go for a liter of DW. I do have some small syringes. That is a good idea to use a syringe rather then drops, easy enough. I'll up the dose in the next batch, likely try .75 ml per liter.
your batch seem to be of good quality. And the somewhat darker yellow might confirm that it's actually a higher concentration
It was the darker yellow of the diluted colloidal silver that threw me. I was expecting it to be a more yellow color such as the straight 20 ppm colloidal silver I had made in the past. But then again I've seen others here post the same thing, that it turns out slightly darker, a more amber or honey color.
measure the current to confirm that the current regulator actually limts the current to 5 mA.
I always do this at the beginning once the cell is going. Just to make sure that the electronics didn't die. Between that and checking the voltage across the electrodes on a regular basis I figure it is good to go.
Argentum
P.S. your work with the stomach acid is superb.