The interference from the beam gives holograms depth, color and motion and a resolution that protects them against duplication from color copiers, scanners or computers. Some businesses view holograms as an attractive security feature because employees can identify them without much training. Holographic images are used to protect sports or concert tickets, gift certificates, rebates and a wide variety of other valued documents. Taking A Look At Special Effects It can be confusing to figure out the differences between common special effects. The plate or die is covered with ink, then wiped dry except on the etched segments.
Paper is forced into the plate by a counter, which is the engraving's male counterpart.
When the paper comes in contact with the counter, the ink is transferred to the paper, giving the image an element of embossing. Precise reproduction of very fine lines gives engraving a stylish look. Unlike engraving, this is accomplished by compressing sheets between two mated dies instead of one die. The dies don't contain ink. One die is a recessed image and the other a raised image etched in reverse of the recessed die to act as a pressure plate.