Nakaya Portable Writer Midori Tamenuri Fountain Pen with Dragon 1 stopper

"Tame" means "pool" and "nuri" refers to the lacquer coating process. You can actually see through the layers of clear urushi lacquer as if you were looking into a pool.

When the process is finished, you can still see the base surface of green urushi. After this coating process, craftsmen polish the surface over and over by hand for months in order to attain greater transparency, allowing you to clearly see the underlying green urushi surface.