Uni-ball ONE Gel Pen Refill UMR-05S 0.5mm

Unlike general gel ink, the newly developed "uni-ball one" ink uses a new pigment that minimizes the penetration of color materials into paper fibers. The pigment used in "Uniball One Ink" is a uniquely developed bead pack pigment that encloses conventional coloring materials in ...Unlike general gel ink, the newly developed "uni-ball one" ink uses a new pigment that minimizes the penetration of color materials into paper fibers. The pigment used in "Uniball One Ink" is a uniquely developed bead pack pigment that encloses conventional coloring materials in particles.

By enclosing the pigment that is the color material of the ink in the particles and increasing the size of the particles, the penetration of the color material into the paper surface is suppressed as much as possible. As a result, the coloring material on the paper develops the original color, black becomes darker, and the color develops more vividly. Compatible with Uni-Ball One and One P pens.