Paul Karason has been left stunned after his skin colour changed to blue. The 57-year-old American used to have a fair complexion, which now has turned blue. He blames it on a substance called ...

Far from a one-off oddity, in 2007 press reports described Paul Karason as a "blue man" after he attempted to cure sinus and skin problems by ingesting a homemade silver chloride solution—and ...