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The Chrysanthos Underglaze Chalk is a remarkable tool that offers endless possibilities for designing on bisque pieces or easily marking ware. The chalks can withstand various temperatures, from Cone 06 to Cone 10, making it a versatile and valuable addition to any artistÕs toolkit. These non-toxic chalks are entirely safe to use, and we proudly say they do not contain any lead. The colors are quite resilient to smudging, but to ensure your design remains intact, itÕs best to slightly sponge over it with clear glaze before brushing or dipping.