In a tradition that scholars date to the 19th century, smoke released from a chimney will be colored white if the cardinals have made a decision, or black if they remain deadlocked.

A new pope will be selected when a candidate gets a two-thirds-plus-one majority vote by the cardinal electors. White smoke will be sent up the chimney of the Sistine Chapel when that happens, to indicate a new pope has been chosen.

Cardinals began the papal conclave at the Vatican's Sistine Chapel to select a new pope after the death of Pope Francis. What does black smoke mean?