Duncan Envision Glazes very black opaque 16 oz. Duncan Envision Glazes work with a variety of decorating techniques and produce a distinctively smooth and elegant appearance. Intense colors range from opaque to transparent. Creamy consistency for excellent brushability. Envision Glazes are perfect for ceramists, schools and finished-ware manufacturers. Works in perfect harmony with other Duncan glazes and underglazes for dramatic results. AP Certified Non-Toxic and Dinnerware safe. Made in USA. Firing Range cone 06 to cone 6.