Indigo underglaze is a deep purple-blue color at cone 05 and darkens under a clear glaze. When fired to cone 5, it becomes more blue in color and then darkens slightly at cone 10.
(V) Velvet Underglaze
•Apply to unfired clay or bisque
•True to color
•Can be used with or without glaze- Food Safe with proper glaze.
•Cone 05 to 10