True blue...

Being a skeptic, I often find people who have fallen for mystical cures being some what "true blue". Even if something is evidently harmful, the true believers seem hard to convince that they've been made a fool. But I seldom see something as concrete as the blue man of Oregon, who believes that the intake of metal in the form of silver makes him well and that his turning blue on the outside is not the cause of that but of him rubbing the stuff into his skin.
Guess what: he's still using the stuff.