This product is characterized by deep blackness, with strong covering power and moderate color, which is suitable for monochromatic species and less color sketch drawing. Tool and methods: 1. When applied in a large area, board brush and large oil painting brush can be used. 2. Goat hair brush, gouache and oil painting pen, paper pen, colored paper, cloth, rubber, small sponge, etc. It can also be rubbed with fingers. 3. Suitable for painting on paper, canvas, drawing board or absorbent substrate. 4. For wet pasting, mix the toner with water or adhesive. 5. After completing the painting, use fixative to fix the color if need.