Black - Color really pops on these mixed media toned paper sketch books. Great for a wide range of dry and wet media, this 150 gsm acid-free fine art paper supports multiple erasures without pilling and holds ink line without feathering. Internal and surface sizing gives these papers remarkable wet strength and forces pigment to remain high on the surface so that color glows. Suitable for colored pencil, ink, gel pens, paint markers, watercolor, gouache, chalk pastels, oil pastels, water-soluble graphite, charcoal, Conte crayon, colored dry pigments, watercolor pencil, soapstone pencil and more. Available in wirebound sketchbooks, each book contains 50 acid-free sheets.