>A new one from the lab supply houses is Nano Silver Powder derived by chemical 
>processes or electro-sputtering...pretty rare in the "supplements" field so 
>far and not much known about it...could be made very strong...might be pretty 
>good...but be careful and watch that total.  Its intended purpose is for 
>glazes, anti bacterial coatings and paint additives etc.

I found one of these places:  http://www.nanomaterialstore.com/nano-silver.php

Wrote and asked them how much water it would take to create a colloid of silver 
using 1 gram of their silver.

The answer:   From: "[email protected]"

1.6wt% 
is 1.6 per hundred. Say, diluting 1mL 1.6wt% solution to 20ppm 
(20E-6) means you need 1.6%*1mL/(20E-6)=800mL water.
BTW, 
we don't have 1.6wt% powder, it is water solution in which Ag is 1.6wt% compare 
to water.
Regards,  Haorong
So one $90 gram of their silver will make 800 mL of CS.  This might be very 
high quality CS, albeit with no ionic content, which is not exactly what we 
want, but the price is pretty prohibitive, IMO.

Dick