Fellow chemists may find this interesting. First, it seems Pope Francis has a master’s degree in chemistry. Very cool! Second, how do they get the black smoke so black and the white smoke so white in the Sistine Chapel chimney smoke signals? For black, they use a mixture is potassium perchlorate, anthracene and sulfur. For white, potassium chlorate, lactose and a pine resin. Very exothermic! This fellow looks like a keeper.