I am testing out Stillman and Birns Sketchbooks. This sketch was done on the Beta Series Sketchbook. It is archival quality paper. Extra heavy weight paper, Natural white 180 lb rough surface paper. Suitable for mixed media and watercolor. The paper is very white which allows the colors to read well and purely. The intensity of the colors on this paper is pretty amazing. These scans don't really capture the hues correctly..which has more vibrancy in real life.