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Offering artists spectacular results that fire true 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. For best results, use Speedball Clear Earthenware or Stoneware Clear Glaze with Speedball Underglazes.

Speedball Underglaze Test Tile Poster

Speedball’s Underglaze Test Tile poster is the perfect addition to any pottery studio or classroom!  This beautiful layout not only adds an eye-catching piece of artwork to your workspace’s wall, it serves as the perfect reference for ALL thirty-six Speedball Underglaze colors.  Showcasing 108 total test tiles all handmade and fired in Speedball’s lab, the Speedball Underglaze Poster accurately represents results at Cones 05, 6 and 10* both with and without the use of the appropriate Speedball clear glaze. The poster comes in both landscape and portrait (17.875″x 23.875″).

*All Speedball Underglazes are dinnerware safe when covered and fired as recommended with a dinnerware safe glaze.  All tiles fired on white bisque tiles.  It is always recommended to create your own test tiles to verify performance with clay body and firing schedule.  


And remember–All orders* above $100 are eligible for free shipping.  Just use coupon code FREESHIP100 at checkout!*

*Excludes Pottery Wheels and Woodzilla Presses; continental US only


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