AMACO Underglaze Decorating Crayon Set contains lilac, gray, light brown, dark brown, yellow-green, medium green, blue-green and medium blue colored crayons in a hinged-lid plastic box. Chalk crayon can be used to obtain watercolor effects by brushing sketches with water. Non-Toxic crayon is used like pastels on bisque and may be blended or smoothed by rubbing with fingers or swabs. It is covered with clear transparent glaze and are sharpened for fine lines or dissolved in water for painting and spraying. The ceramic decoration allows for unusual effects and a variety of textures.