Professional engineer, Dr. Roger Altman, used colloidal silver made with a high voltage system to measure excretion in relation to the amount he drank. In “Colloidal Silver: Where does it go when you drink it? How long does it stay there?” he reports on his personal experiment. The results indicate that the body processes colloidal silver in a beneficial way and also indicates that when colloidal silver is made properly, the risk of argyria—a darkening of the skin—is minimal. 1999.