定義

• Decayed Lead.  An advanced state of lead disease. The lead object will be covered with white to gray powder. If left unattended it will decay to a powdery lump. Treatment for decayed lead is described in the entry on lead disease.
                                                                                                                                                                                                                                                                                                                         

  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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