WHAT IS A LITHOGRAPHY?
Offset Lithography is a photo-mechanical technique. The original
artwork or transparency is scanned and from the scanned image the four
separations (or film) are output. From the separations, the image is
etched on to photo-sensitive metal plates. The plates are loaded on to
the press for printing. The reproductions are printed with the highest
UV rated inks available, on 100% acid-free paper.
Source: The Color Q Connection: Spring 1998