Définition

• Chalking.  A deteriorated condition of zinc. A conversion of the surface of zinc into zinc oxide with white chalk-like appearance; hence any powdery white chalky metal surface. Chalking is also called white rust and is removed by buffing with the use of a soft cratex abrasive.
                                                                                                                                                       

  excerpted with permission from

  An Encyclopedia of Coin and Medal Technology

  For Artists, Makers, Collectors and Curators

  COMPILED AND WRITTEN BY D. WAYNE JOHNSON

  Roger W. Burdette, Editor

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