V-379 Ultra Violet UnderglazeUltra Violet Velvet Underglaze is a soft, pinkish purple at cone 05, darkens slightly at cone 5, then lightens when fired to cone 10 but still maintains its violet shade. A clear glaze accentuates the color of the underglaze significantly at any temperature. Due to variations in raw materials used during manufacturing, we recommend firing glazed test tiles before using each new batch number of glaze.