Office and desk workers are described by which color of collar?

Which color names both the University of Alabama's "Tide" and a DC Comics masked avenger? Which color fills both blanks: W.H. Hudson's novel "___ Mansions" and Emlyn Williams's play "The Corn Is ___"? What color of smoke from the Sistine Chapel signals that a new pope has been elected? What color is the balloon in the title of the classic 1956 French short film? The male lazuli bunting, a songbird of the western U.S., has a head of which color? Under modern chess rules, which color always makes the opening move? Color traveling-matte photography put Julie Andrews, Dick Van Dyke and cartoons together in which 1964 film? Which 1986 Madonna album went to No. 1 and has a color in its title?