The infamous "blue man" Paul Karason mixed salt with his homemade silver. He also used tap water, brewed the silver too long and drank over a quart a day for months. Not a good idea unless you want to join the Smurffs and be paraded around the country as a circus freak for the media as has happened with Karason.
You are right. The very rare blue people that mainstream medicine and their media lapdogs like to use to warn us about the dangers of colloidal silver all appear to share a common trait: they took very large amounts of an improper form of silver solution over a prolonged period of time.
Yes, Karason not only made improper ionic silver from tap water and salt, he also rubbed it into his skin and consumed more of it than probably just about anyone on earth (over a quart a day) for over a year. Personally I think he revels in his celebrity. What has been largely overlooked is the fact that, despite turning himself blue with wrongly prepared silver and drinking huge quantities, he was nevertheless given a clean bill of health after a complete physical at Mount Sinai Hospital.
The other two rare "blue people" that have been paraded around by MAIMstream MediSIN are the Montana senator who made similarly wrong silver with tap water and salt and Rosemary Jacobs, who used and abused a prescription Silver Nitrate nasal spray for years. It is virtually impossible to find instances of Argyria from properly prepared ionic or colloidal silver the same as it is virtually impossible to find any instances of harm from taking such products.