This is maybe the most epic thread resurrection ever, but for those interested in colloidal silver i thought i would chip in. I found this formula could be what you are looking for?
2 Ag + 2 OH -> Ag2(OH)2 (silver hydroxide)
Ag2(OH)2 <–> Ag2O + H2O (silver hydroxide <-> silver oxide) "colloidal silveroxide"
The ionic portion of colloidal silver is a mixture of silver hydroxide and silver oxide, each with a solubility of just over 13 ppm.
To get colloidal silver and not colloidal silveroxide we need to boil the silver oxide to get:
Ag2O -> 2 Ag + O (silver) "colloidal silver"
(I could be wrong here, i just pulled this off the net but it looks decent to me. I also did a test with what is commonly known as colloidal silver by boiling it for 10 minutes, and it indeed turned color just as i had read it should when turning into the claimed proper colloidal silver.)
