Medium Blue Matte Ink is a brilliant primary blue that is vivid at cone 05, darker at cone 5, maintaining its blue color. A clear glaze over Medium Blue will significantly darken the color. Like an underglaze, this Medium Blue Matte Ink fires to a matte finish that requires a clear glaze to be considered food-safe. Too thick of an application of the ink may result in a glossy finish. Cones 05-6.