For those who use colloidal silver as an antibiotic for themselves or pets, but who haven’t yet discovered how to avoid bankruptcy buying it from health product stores:
This 4 fluid oz bottle was purchased in 1995 at a cost of $23.49 from a health product store. I’d hate to even speculate what it would cost today.
By using the method illustrated in the first picture you can turn out a gallon of stronger solution for a fraction of a penny. Just be sure you use unalloyed silver. Not Sterling.