V-391 Intense Yellow UnderglazeIntense Yellow Velvet Underglaze is a bright pineapple color that is vivid at cone 05, deepens at cone 5, and is the deepest and most intense at cone 10. A clear glaze deepens the color of the underglaze significantly at any temperature. For Intense Yellow Velvet Underglaze, we recommend using HF 10 Clear. HF 9 Zinc Free Clear is recommended for use with underglazes to reduce the incidence of color shift. Most underglazes, stains, and coloring oxides