A blue dye that has allegedly been made difficult to possess since WWII. Walter J. Kilner (1847–1920), a British physician, developed “screens” consisting of two sheets of glass with dicyanin sealed between them. He believe that by looking through them you could sensitize your eyes, allowing you to see onto the astral plane. For years, FATE magazine sold small versions of these “Kilner Screens” or “Dicyanin Screens” known as “Aura Goggles.”