Offering artists spectacular results that fire true across the vast majority of the color range consistently, Speedball’s Underglazes are unmatched in vibrancy and value.  Originally formulated to perform in a wide firing range, 05-6, Speedball’s Underglazes have been successfully fired at Cone 10.  Suitable for use on greenware or bisque, each color produces a softer, velvety finish when left unglazed, and intensifies in richness when covered with a clear glaze*.  Trusted by some of today’s most well-known and acclaimed ceramic artists, Speedball Underglazes offer incredible quality at an unbeatable price—on average, saving artists over 50% versus leading brands.

All colors are dinnerware safe when used and fired as directed, are lead-free and carry the AP Seal. Select below to see the full range of colors!

AP Seal

*For best results, use Speedball Clear Earthenware or Stoneware Clear Glaze with Speedball Underglazes.  Speedball recommends making test tiles specific to artist's clay body and firing schedule.


NOW AVAILABLE, this beautiful poster showcases 108 total test tiles, all handmade and fired in Speedball’s lab, and is printed to accurately represent results for all 36 underglaze colors at Cones 05, 6 and 10 both with and without the use of the appropriate Speedball clear glaze.  (17.875″x 23.875″)


See a selection of our underglazes and glazes featured on the works of some of today’s most popular ceramic artists in the Speedball Ceramics Gallery or Professional Artist Network.