"Laboratory analysis has shown that the amounts of silver in supplements vary greatly, which can pose risks to the consumer."
There is a certain amount of truth to what the NIH states here. But it makes it all the more important that consumers migrate eventually to D-I-Y EIS. Incidentally, I prefer thermal stirring because I conjecture that it seems to accomodate the formation of silver slick on the top surface of the brew a little bit better than other stirring methods. The appearance of the silver slick is a natural end-point indicator - inexpensive, objective, reproducible, and a useful byproduct. (I suck it off with a glass tube and swish it around my mouth like a mouthwash.) Matthew
