Re: Colloidal Silver
Silver and gold, of course, are highly tied up with the Philosopher's Stone. However, it is I believe absolutely vital to be using the very purest silver in any Colloidal Silver product. i.e. 99.999999% pure.
Sadly, because of the "craze", there are inevitably plenty of unscrupulous suppliers out there making products from much lesser purities of silver. Imagine how costly 99.9999% silver is and how that would affect prices and margins.
The only real way to know is to make your own which is not that difficult it seems though never done it myself.