Définition

• Surface Deformation.  A cast object's most obvious surface imperfections. Surface deformations are caused by a number of reasons including: occluded gas (improper sprueing), insufficient metal (pouring anomalies), or cooling too fast (freezing out) before the mold was filled. These surface blemishes most often appear as a scab or a void. All such casts would be immediately rejected and recast.  An internal defeciency is termed simply, deformation, but in most instances it affects the surface as well.

  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

Des relations