Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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plate mark ( plate line )

An impressed line denoting the boundary of a plate used in making an engraving. It is caused by the pressure applied to make the impression on the sheet. The part of the paper on which pressure was applied is depressed and smoother than the surrounding area. Occasionally faint traces of ink can be seen along the plate line if the plate was not properly cleaned before printing. (156 )

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