The Potter's Choice glaze series was designed with the potter in mind! These stunning glazes add fluid colors and effects to smooth or textured ware, with optimal results at Cone 5/6. To use these glazes is to step into different ceramic glaze traditions of many cultures throughout history.Blue Midnight is a high fire, opaque glossy black glaze that breaks into blue highlights where thick. It is used to achieve authentic reduction fire effects in your electric kiln. This glaze is good for textured work and also layers well with other Potter's Choice glazes.