What do Cones in a kiln indicate?

Cones in a kiln are specifically designed to indicate the temperature range during the firing process. They are made of ceramic materials that are formulated to bend or melt at certain temperatures, reflecting the heat within the kiln. As the kiln reaches specific temperatures, the cones respond by bending, which provides a visual cue to the potter or ceramic artist about the conditions inside the kiln. This is crucial for achieving the desired results in glazing and clay firing, as different materials and techniques require precise temperatures for successful outcomes.

In contrast, other choices do not accurately describe the function of kiln cones. The type of glaze used affects the outcome but is not indicated by the cones themselves. The duration of firing can influence the final product but is not measured by the cone's position. Similarly, the density of clay is a characteristic of the material and does not relate to the temperature information that cones provide.