*FORMULA CHANGE ON THE FOLLOWING CLAYS*
*181, 417, 420, 563, 630*
Ultramarine jewel is a deep, glossy purple glaze with shimmering bright yellow glaze crystal bursts that add depth and interesting effects to ceramic ware. The glaze crystals can be moved around with a paintbrush, which will affect where the different colored spots will appear.
Tableware producers must test all finished ware to establish dinnerware status, due to possible variations in firing temperature and contamination.