Amaco underglaze chalk crayons can be used on ceramics the same way you would use a chalk pastel on paper. Colors can be blended or smoothed by using your finger or a cotton swab. You can even achieve watercolor effects by using water and a paint brush. The chalks are soft enough to be sharpened, so if you want clean, sharp lines, you can get those results, too! The possibilities are endless!
NOTE: The maximum firing temperature is Cone 10 for the following: Black, Brown, Dark Blue, Dark Green, White, Gray, and Medium Blue. The maximum firing temperature is Cone 5 for the following: Turquoise, Yellow, Dark Brown, Blue-Green, Light Brown, Medium Green, and Yellow-Green. The maximum firing temperature is Cone 05 for the following: Rose and Lilac.