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A metal plate used for letterpress printing. Photoengraving plates are usually made from pure Magnesium because it is lightweight, easy to etch, and resistant to wear.
Resources and Citations
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 478
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998