There are two types of EFFECTIVE Colloidal Silver
Ionic has two atoms and is effective, but it has chemicals aka protiens.
The CS of are single particles of atoms with an opposite spin of a normal atom and are called monatomic.
Because the particle size of the atom colloids are unique and made with no chemical, they are much more effective.
Because they come in 3000 PPM up to 15000 PPM, the effect is like a machine gun spraying bullets at a target.
There are other inferior low grade Colloidal Silver
producer out there that generally make 20 PPM and Under.
When analysed, you will find that they have some kind of color, that color is the chemicals that help the particles stay suspended in the solution.
Because I hate chemicals and the side effects that they cause, I recommend that you search for the most natural and oranic Colloidal Silver
You will have to buy the product, but the cost per particle is only about .016 Cent vs others cost of $2.45 Cent for the Low Grade 20 PPM Colloidal Silver.
I hope this answers your questions