Testing a New Black Schwarz Stoneware Clay Body

Learn to test and evaluate a new black stoneware clay body called 'Schwarz' from Valentine Clays through hands-on experimentation. Explore the unique properties of this clay containing 25% grog with exceptionally fine particle size (0.02mm), which creates a smooth throwing experience despite the high grog content. Follow along as three test bowls are thrown using different clay mixtures - 100%, 66%, and 50% black stoneware - to determine optimal firing characteristics and color retention. Discover the challenges of working with a lower maximum firing temperature of 1240°C and observe techniques for mixing the clay with higher-firing bodies to achieve firing temperatures up to 1290°C. Watch detailed demonstrations of throwing and trimming processes while learning about clay body testing methodology, grog content effects on workability, particle size impact on clay smoothness, and strategies for adapting commercial clay bodies to specific firing requirements.