Generally speaking, a 3 - 10 PPM high quality colloidal silver product is a sufficient concentration for effectiveness in the body. (silvermedicine.org)
As a result of the research he conducted Professor Ronald J Gibbs, director of the Center for Colloidal Science at the University of Delaware between 1981 - 2000, reported that all of the highest quality colloidal silver products were colorless. (bio-alternatives.net)
It is IMPERATIVE that pure water be used in the manufacture of quality Colloidal Silver to prevent these compounds from forming. (bio-alternatives.net)