Spectrum underglazes are all lead-free, dinnerware safe, and A/P non-toxic when covered with a clear glaze. Underglazes can be used at almost any temperature range and can be applied to bisque or raw clay. Two to three coats are required for opaque, vibrant colors. The Samples shown are at Cone 05, but the underglazes can be fired from low-temperature (cone 06/04) to high-temperature (cone 9/10). Some color variation will occur at higher temperature and also different clear coats and thicknesses can affect the hue of each underglaze.