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Pope Election: The Chemistry Behind The Black And White Smoke

  • One hundred thirty-three cardinals gathered in the Vatican this week to elect a new pope in a conclave held inside the Sistine Chapel.
  • The practice of burning ballots for confidentiality began in the 15th century and developed further in the 18th century when a chimney was added to the Sistine Chapel to prevent damage to Michelangelo’s frescoes.
  • Black smoke, created from burning ballots with potassium perchlorate, anthracene, and sulfur, signals no two-thirds majority, while white smoke from potassium chlorate, lactose, and rosin marks a pope’s election.
  • In 2013, the Vatican confirmed these specific chemical recipes and explained black smoke signals inconclusive votes and white smoke announces the successful election of a new pope.
  • These smoke signals remain the only communication with the outside world during the conclave, indicating ongoing voting until a candidate achieves a two-thirds majority.
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pnt.cl broke the news in on Tuesday, May 6, 2025.
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