Fluid Graphite is a high-viscosity ink that combines graphite with synthetic resin.  It has both a metallic shine and matte texture specific to graphite.  You can create unique, textured work by mixing it with other painting mediums.  Water-based pigment ink, Lightfast.  Since this product is in paste form, you can mix it easily with Gansai Tambi etc. to make a dull grayish color.