It's very telling that the argyria hypers can only point to three cases: Rosemary Jacobs, Stan Jones, and Paul Karason, none of whom actually used properly made, electrically isolated silver. Rosemary used some kind of concentrated silver salt nose drops, and the other two drank large quantities of improperly made homebrew CS, using tap water or added salt. Properly made, with .999+ silver and pure, steam distilled water only, it will only contain a maximum of around 20 PPM silver. At that concentration, argyria is still possible, but it would require drinking large quantities (12+ ounces a day) for an extended period of time.