Pilot Iroshizuku bottled ink from Japan feature rich and subtle colors. The name "Iroshizuku" is a combination of the Japanese words "Iro (coloring)", expressing high standards and variation of colors, and "Shizuku (droplet)", that embodies the very image of dripping water. Each Iroshizuku bottled ink name derives from the expressions of beautiful Japanese natural landscapes and plants, all of which contribute to the depth of each individual color.

Tsuki-Yo, or moonlight, is a dark blue shade (deep teal) like the night sky, dimly illuminated by moonlight. The hand-blown 50ml bottle with nib cut-out enables filling to the last drop. Acid-free, archival safe.