YMCKTK ribbons consist of yellow (Y), magenta (M) and cyan (C) panels for printing a full spectrum of colors by combining the colors using varying degrees of heat. The two K panels are black resin, typically used for printing text and barcodes and the T panel is a thin, clear protective overlay. The Entrust ribbons are used for dual-sided printing, with YMC, the first K panel and the T panel for printing on the front side, the second K panel prints on the back side of the card.