Jet Black Matte Ink is a cool black color that is smooth and velvety at cone 05, darkens at cone 5, and becomes darkest black and slightly glossy at cone 10. A clear glaze deepens and accentuates this ink. Like an underglaze, this Jet Black 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.