Definition

• Friction.  A collectors' term for repeated wear on a particular area of a numismatic item. Also called friction marks. Ser also CABINET FRICTION.
  Frosted Surface.  The area on a proof finish piece that is not reflective, but is matte and looks "frosted." A frosted surface is created with hydrochloric acid or other matting solution, sandblasting or methods and is applied to that area of a die before the proof area is proof polished. It use in design is for contrast to the highly reflective proof finish.  See reflectiveness.
  CLASS 04.8
  3400-(001)05.2

  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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