定義

• Blotch.  An area of different color on the surface of a numismatic item due to blemish, toning, tarnish or an unstable patina. It is not a serious defect as it can be completely removed by refinishing should this be so desired.

  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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