Definition

• Mordant.  An acid solution that bites into metal, the active agent used in acid etching. The most common acids are solutions of nitric, hydrochloride or ferric chloride.  See acid etching.
      

  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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