Definition

• Annealing Distortion.  A change – actually a melting – of the surface configuration of an object during annealing. Steel dies are susceptible to annealing distortion when the heat of the annealing furnace rises above the melting point of the die's composition. Detail in the die becomes indistinct, sharp edges of lettering and design become rounded. Accurate control of the furnace heat is a must but this was a persistent problem when annealing was done with an open flame.  See heat treating.

  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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