Duncan Courtyard Art Glazes - CY 116 - Lava Slate - 4 Ounce Jar Duncan Courtyard Art Glazes can give your ware that rich, antiqued look in a variety of colors. Glazes are truly unique, with no two firings giving exactly the same results. Courtyard Art Glazes work well with Concepts Underglazes for Majolica and Bisque. For both Low Fire and High Fire Applications, apply 2-5 coats to cone 04 bisque. Let dry between coats. For Low Fire, stilt and fire to cone 06. for High Fire, fire to cone 5-6. AP Certified Non-Toxic. Made in USA.