How to Use Magma Posted on August 6, 2020August 8, 2022 by Kelsey Wilcox Cone 6 White Clay Cone 6 Speckled Clay Cone 6 Dark Brown Clay Cone 10 White Clay Cone 6 White Clay Cone 6 Speckled Clay Cone 6 Dark Brown Clay Cone 10 White Clay Glaze will perform differently based on clay bodies and firing temperature used. The choice of clay body, thickness of glaze application, firing process and temperature will affect the fired results. Always test in your kiln and on your clay body.