Definizione

• Shear Marks.  Striations on the edge where metal has been cut off, particularly on blanks. The slightest irregularity on the edge of the blanking die – as a tiny nick or scratch – will cause such striations or streaks in the metal cut off. Shear marks on the edge are not to be confused with burrs, which are a trail of metal debris on the exit side after blanking. Both shear marks and burrs remain on the blank until it is upset, ground off or polished.  See blanking.

  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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