Definição

• Embedment.  (2) The complete encasement of a coin, medal or medallic item in a transparent material, as glass or plastic. Lucite (trademark of E.I. DuPont De Nemours & Co.) is the most often used plastic for embedments. Advantages of embedding numismatic items include protection and ease of display; disadvantages include not being able to touch the items or examine them closely.
  How embedments are made.  A mold is required nearly the shape of the final embedment. It is half filled with molten plastic. The medal or other item is laid on the surface of this molten plastic in the exact position required. It will float on the plastic. The mold is then filled with the remainder of the liquid plastic. It is then baked and thoroughly dried. The process does generate heat but this does not harm metallic items (it will, however, effect paper and heat sensitive items, which are best not embedded). After cooling, the item is then buffed and polished.
  Removing embedded items.  An embedded item may be removed from Lucite but the process requires several steps: cut away as close to the item as possible with a bandsaw, chip away with hammer and chisel and dissolve the remaining Lucite in warm galacial acetic acid.

  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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