This high-viscosity ink is a combination of graphite and synthetic resin. It produces a matte texture and a metallic finish by polishing (after drying) the surface where it has applied a thick coat. Since it is a high-viscosity ink, you can thin it down before use or apply it as is to create a more three-dimensional, dynamic expression. You can also mix it with pigments and other watercolors before use. *Graphite comes from the same carbon family group as diamonds, charcoal, coal, carbon black, etc.