AMACO Underglaze Decorative Pencil is designed specially for shading, fine line drawing or identification and features bright and intense. One coat of transparent glaze applied over the underglaze by sponging, spraying or dipping the decorative piece avoids smearing. Non-Toxic underglaze features a firing range of Cone 06 - 05. Underglaze pencils come in a plastic case and are sold as 6 per set with one each of Rose, Yellow, Blue, Green, Brown and Black.