But conclave changes made by Pope John Paul II in 1996 required three vessels: one for chapel ballots, another for ailing cardinals at the Vatican who can vote from their beds and the third to hold the ballots after counting. Outside, in St Peter's Square, tens of thousands of Catholics will be watching - along with millions more on television around the world - to see smoke emerging from the chimney of the Sistine Chapel after each voting round. Black smoke means no decision has reached, white smoke means a new pope has been selected. The smoke arises from the burned ballots, and a dye is added to make sure the smoke is the right colour each time. Once the cardinals have chosen from among their number the master of liturgical ceremonies will enter the Sistine Chapel. The prospective choice will be asked: 'Do you accept your canonical election as Supreme Pontiff?' Assuming they say, 'I accept', the cardinal will then be asked by what name they wish to be known. The new pope will then be given their iconic white cassock, before each cardinal approaches him to swear obedience.