passagreen" is word for an odorless, tasteless backwood poison extracted from mothballs, used in the rural South in the early 20th century, maybe later. The ingedient would have been naphtalin.
Delta-Bluesman and eye-witness to Robert Johnson's death-struggle David "Honeyboy" Edwards suggested that Johnson may have been poisoned with passagreen.
by Catfish540 January 21, 2009