Based on our 150 test-tile study across four clay bodies in electric kilns, oxidation and reduction firing atmospheres create dramatically different glaze colors from identical materials, with copper producing green in oxidation versus deep ruby red in reduction at cone 6 (2232°F/1222°C). This atmospheric control matters because oxygen availability during cooling determines which metal oxides…
Kiln wash acts as a protective barrier between your ceramic pieces and kiln shelves during firing, preventing costly damage and stuck pottery. Applied correctly at 2-3 thin coats using a 50:50 ratio of kaolin clay to silica sand mixed with water, kiln wash creates a sacrificial layer that absorbs glaze drips and prevents shelf contamination…
Professional glaze firing delivers consistent results when you fire cone 6 (2232°F/1222°C) glazes using proper temperature schedules, controlled heating rates, and systematic troubleshooting approaches. The temperature matters because cone 6 achieves complete glaze maturation while preventing the warping and crawling common in cone 10 pottery on thin forms. Based on extensive kiln testing across multiple…
Bisque firing transforms raw clay into durable ceramic ready for glazing by heating pieces to 1830-1945°F (Cone 06-04) in a controlled atmosphere that removes all physical and chemical water while maintaining porosity for glaze absorption. This first firing matters because it converts fragile greenware into stable bisque that can withstand handling and glaze application without…
Based on our extensive testing across 200 test tiles in electric kiln firing, earthenware fires at Cone 04-06 (1830-1940°F), stoneware at Cone 5-6 (2165-2232°F), and porcelain at Cone 8-10 (2280-2345°F) for optimal strength and functionality. These temperature ranges matter because firing too low leaves clay soft and porous, while firing too high causes warping, cracking,…
Kiln furniture refers to ceramic supports (shelves, posts, stilts) that hold pottery during firing, with high-alumina shelves at 99% alumina content rated for cone 10 (2345°F) and silicon carbide posts offering superior thermal shock resistance. These refractory supports prevent warping, enable efficient kiln loading, and protect glazed surfaces from flame contact during high-temperature ceramic firing…