Hi,
I made some colloidal silver today and something funny happen. The negative 
side of silver rod had residue on the rod that looks like fungus and the 
positive rod was giving out a brown fog that goes to the bottom. Before I 
started I cleaned the silver rods with nylon cloth and paper towels with 
distilled water. I used four nine-volt batteries and brewed it for 30 minutes. 
(I followed the the instructions from the book Colloidal Silver Today by Warren 
 Jefferson. 
 
Ben