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Ceresin (also cerin, cerasin, cerosin, ceresin wax or ceresine) is a wax derived from ozokerite by a purifying process.

The purifying process of the ozokerite commonly comprises a treatment with heat and sulfuric acid, but other processes are also in use.

Uses include:

  • An alternative to beeswax in ointments
  • (Historic) Laboratory-supply bottles for small amounts of hydrofluoric acid, which were made of ceresin wax; this was before polyethylene became commonplace.

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