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Wax is thermally decomposed in the hot parts of the dark zone I of a candle flame. Here no oxygen is available. In the first reaction step, C–C bonds break to produce pairs of hydrocarbon radicals. Overall a variety of reactions takes place, leading to a mixture of smaller, unsaturated aliphatic, alicyclic, and aromatic hydrocarbons.

• Chemistry of the Christmas Candle — Part 1,
  Klaus Roth,
  ChemViews Mag. 2011.
  DOI: 10.1002/chemv.201000133
• What Makes a Candle Flame?,
  ChemViews Mag. 2011.
  DOI: 10.1002/chemv.201000145