One of the functions of the Sistine Chapel is as a venue for the election of each successive pope in a conclave of the College of Cardinals. On the occasion of a conclave, a chimney is installed in the roof of the chapel, from which smoke arises as a signal. If white smoke, which is created by burning the ballots of the election, appears, a new Pope has been elected. If no candidate receives the required two-thirds vote, the cardinals send up black smoke—created by burning the ballots along with wet straw and chemical additives—it means that no successful election has yet occurred.