KD (german for communication design) is a free project in photography and design. It is about a lot of stuff which is needed by studying communication design. These two pictures shows the equipment of etching, a traditional printing technology, and linolcut, a special printing technology in letterpress.
Intaglio vs relief printing
Intaglio is an etching printing technology, where the lower elements are printed and the higher ones not. It is almost the opposite of Letterpress. Linolcut, one special printing technology in Letterpress, is like stamp printing: the higher elements were printed.