Underglazes are colors you can paint onto either leather hard or bisque fired pieces. The advantage of using under glazes is that the colors can be more vibrant and you have more flexibility in creating patterns or designs. For this slump mold bowl, I masked off each half of the leather hard piece and sprayed two colors with a mouth sprayer. Then, I rolled black under glaze onto some netting fabric and pressed it onto the piece down the center. The black trim was applied loosely with a sponge along the outer edges.