The GM400 Real Touch Gundam Blurring Marker does not add any color, but is used to blend ink previously applied on gunpla models by other Real Touch Markers! This feature opens the door to several possible effects!
You can lighten a color, blend a surface, fade two colors together, apply weathering effects, etc.

This special marker is provided with tips at both ends: a large one and a fine one. This way you have the opportunity to work comfortably both on large areas and on small details.