Duncan Renaissance Glazes - RG 727 - Midnight Sky - Pint Duncan Renaissance Glazes are a premier mid-range glaze family, that modernizes art history. The unique glaze colors offer a rich palette with beautifully unpredictable color breaks. Create one-of-a-kind masterpieces in every firing. Overglaze compatible. Safe for food containers. Fires to cone 5-6. AP Certified Non-Toxic. Made in USA.