Printing plates are rare inserts in Garbage Pail Kids packs that are the actual printing plate used to print the cards.
Commercial printing presses print with cyan, magenta, yellow and black (CMYK) ink.
By combining and aligning the cyan, magenta and yellow colors an entire range of colors can be achieved. For more information on the CMYK color model click here.
To print Garbage Pail Kids the printer uses four different color plates (one for each CMYK color). In offset printing, the plates are not reversed. The image is first inked on the plate. Then the ink is stranfered in reversed image onto a rubber blanket, then to the card sheet. For more information on offset printing click here.