Amaco Potters Choice: Black AventurineAmaco Potters Choice: Black Adventurine 473ml Black Aventurine is a fluid, rich black glaze that develops a metallic sparkle. If slow cooled, this glaze will grow crystals.. Due to the powdered nature of the materials involved with the dry mix dipping buckets of this product, their respective health information and labels differ from the brushing glazes. Safety Warning Tableware producers must test all finished ware to establish dinnerware status, due