Here is a great book on Colloidal Silver: COLLOIDAL SILVER by Mark Metcalf.
Gives the history, medical value and how-to-make.
Try going to
www.amazon.com for a book purchase... get it used and save cash.
Greg222
PS
If you wish to purchase the colloid directly, I recommend SUPER SILVER SOLUTION. It is a slightly different process for its manufacture, it doesn't oxidize when exposed to light quite so quickly, so it's great for your pet's water bowl.