Definição

• Proof Blank.  An extensively cleaned and polished planchet intended to be struck by proof polished dies to create a struck piece in mirror-like proof finish. Blanks for proof coins are treated exactly like other blanks except they are carefully polished to a mirror-like surface and inspected prior to use. Generally proof blanks are airblasted with compressed air to remove any contaminates as even lint can mar the mirror surface. For a proof striking, press operators wearing protective gloves hand feed the planchets (as perspiration from bare fingers will soil the surface as well). Proof strikes can only be created from such polished blanks and mirror-like polished dies. They are also called FLAN BRUNI (French for burnished blank[RWB2] )..

  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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