Entrust YMCKK ribbons are used for printing a combination of full-color images and one-color text or barcodes, and feature an Earth-friendly biodegradable core. YMCKK ribbons consist of yellow (Y), magenta (M) and cyan (C) panels for printing a full spectrum of colors by combining colors using varying degrees of heat. The two K panels are black resin, typically using for printing text and barcodes.