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Line plates are usually etched to depths of 0.010 to 0.045 inch. Halftones may be
etched to depths of 0.0023 to 0.009 inch, depending on the fineness of the
screen. Coarser screens are etched deeper. Photosensitive plastic plates are not
required to copy them for use in making a printing plate. Suitable copy consists of
line drawings, etchings, etc. The negative as it comes from the process camera is
suitable to transfer the line image onto the metal. Plate preparation, coating ...
Zinc and aluminum, however, cannot be steel-faced. Mezzotint. In mezzotint the
metal plate is roughened with fine burrs until it prints a rich, velvety black. The
plate is then worked back toward the lighter values with scrapers and burnishers.
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The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review