Holbein made sketchbook using Mermaid paper. NpH, 100% pulp, 100lb. (235g), light buff paper, textured, 18 sheets, spiral bound

A feltmark is the surface structure imparted to paper at the paper mill by using felt with a woven pattern that transfers to the surface of the paper. MERMAID, which was designed and launched in 1956 under the editorial supervision of designer Hiromu Hara (1903-1986) is a feltmarked fine paper produced by machine in Japan.
The resemblance of the feltmark to gentle waves inspired the paper’s name, and it was launched as MERMAID RIPPLE, recalling the gentle waves of a sea where mermaids live. Then, in 1960, it became known simply as MERMAID.
MERMAID is widely used for painting and as design paper, and is widely appreciated as a paper for use in bookbinding.
MERMAID can be manufactured without using aluminium sulphate, a chemical that is one factor in the degradation of paper. Use of high-quality pulp and dyes makes the colors fade-resistant, and the paper resists creasing well. These characteristics make MERMAID suitable for long term storage or preservation.