DELTA SERIES – SOFTCOVER SKETCHBOOKS Stillman & Birn Delta Series Softcover Sketchbooks, 270 gsm ( Extra Heavyweight), ivory paper, cold press surface. Suitable for dry and wet media, watercolor and ink. Example of recommended usage: working in heavier washes or overlaying washes (glazing) of watercolor or gouache. Softcover bindings are flexible and lightweight and open totally flat. Acid-free, chloride-free, lignin-free.
