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 | Glossary Of Printing Terms
  [5] |  | E Emboss  To create either raised or recessed relief images and designs in paper and other materials. An embossed pattern is raised against the background, while a debossed pattern is sunken into the surface of the material (but might protrude somewhat on the reverse, back side).
 |  | Emulsion  In the process of screen printing, a light sensitive liquid chemical that is applied to the screen whicht becomes most light sensitive when dry. |  | End Sheet  Also endpaper, a blank or decorated leaf of paper at the beginning or end of a book, especially one fixed to the inside of the cover. |  | EP  Electrophotography, or EP, is the oldest of the non-impact printing technologies, having been invented in the mid 1930's by Chester Carlson. Electrophotographic printing is also often referred to as Xerography (meaning dry writing) and/or laser printing. |  | Etch  Etching, a method of making prints from a metal plate, usually copper, into which the design has been incised by acid. The copperplate is first coated with an acid-resistant substance, called the etching ground, through which the design is drawn with a sharp tool. The ground is usually a compound of beeswax, bitumen, and resin. The plate is then exposed to nitric acid or dutch mordant, which eats away those areas of the plate unprotected by the ground, forming a pattern of recessed lines. These lines hold the ink, and, when the plate is applied to moist paper, the design transfers to the paper, making a finished print.
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